diff --git a/paddle/fluid/distributed/ps.proto b/paddle/fluid/distributed/ps.proto
index 002be15b003eb3464d8b141fabb525d2fe0ddc01..4483f960eb1371eb276edd7b512e04db8be6f25c 100644
--- a/paddle/fluid/distributed/ps.proto
+++ b/paddle/fluid/distributed/ps.proto
@@ -119,13 +119,11 @@ message TableParameter {
 
 message TableAccessorParameter {
   optional string accessor_class = 1;
-  //  optional SparseSGDRuleParameter sparse_sgd_param = 2;
   optional uint32 fea_dim = 4 [ default = 11 ];
   optional uint32 embedx_dim = 5 [ default = 8 ];
   optional uint32 embedx_threshold = 6 [ default = 10 ];
   optional CtrAccessorParameter ctr_accessor_param = 7;
   repeated TableAccessorSaveParameter table_accessor_save_param = 8;
-  //  optional SparseCommonSGDRuleParameter sparse_commonsgd_param = 9;
   optional SparseCommonSGDRuleParameter embed_sgd_param = 10;
   optional SparseCommonSGDRuleParameter embedx_sgd_param = 11;
 }
@@ -182,13 +180,6 @@ message TableAccessorSaveParameter {
   optional string deconverter = 3;
 }
 
-// message SparseSGDRuleParameter {
-//    optional double learning_rate = 1 [default = 0.05];
-//    optional double initial_g2sum = 2 [default = 3.0];
-//    optional double initial_range = 3 [default = 0.0001];
-//    repeated float weight_bounds = 4;
-//}
-
 message SparseCommonSGDRuleParameter {
   optional string name = 1;
   optional SparseNaiveSGDRuleParameter naive = 2;
diff --git a/paddle/fluid/distributed/table/CMakeLists.txt b/paddle/fluid/distributed/table/CMakeLists.txt
index b4b87e652b7dbc8b25337a1ff38ee3e1135204ad..7ec7041b63ba1ffa00e49b64a8816c26273bc9aa 100644
--- a/paddle/fluid/distributed/table/CMakeLists.txt
+++ b/paddle/fluid/distributed/table/CMakeLists.txt
@@ -36,7 +36,8 @@ cc_library(tensor_table SRCS tensor_table.cc DEPS eigen3 ps_framework_proto exec
 set_source_files_properties(table.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 
 set_source_files_properties(sparse_sgd_rule.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
+set_source_files_properties(ctr_accessor.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 cc_library(sparse_sgd_rule SRCS sparse_sgd_rule.cc DEPS ${TABLE_DEPS} ps_framework_proto)
+cc_library(ctr_accessor SRCS ctr_accessor.cc DEPS ${TABLE_DEPS} ps_framework_proto sparse_sgd_rule)
 
-
-cc_library(table SRCS table.cc DEPS common_table tensor_accessor tensor_table ps_framework_proto string_helper device_context gflags glog boost sparse_sgd_rule)
+cc_library(table SRCS table.cc DEPS common_table tensor_accessor tensor_table ps_framework_proto string_helper device_context gflags glog boost ctr_accessor)
diff --git a/paddle/fluid/distributed/table/ctr_accessor.cc b/paddle/fluid/distributed/table/ctr_accessor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1ef8c9e152733fe0c6bf622fd3a5f3f57f15cdb5
--- /dev/null
+++ b/paddle/fluid/distributed/table/ctr_accessor.cc
@@ -0,0 +1,329 @@
+// Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "paddle/fluid/distributed/table/ctr_accessor.h"
+#include <gflags/gflags.h>
+#include "glog/logging.h"
+#include "paddle/fluid/string/string_helper.h"
+
+namespace paddle {
+namespace distributed {
+
+int CtrCommonAccessor::initialize() {
+  auto name = _config.embed_sgd_param().name();
+  _embed_sgd_rule = CREATE_PSCORE_CLASS(SparseValueSGDRule, name);
+  _embed_sgd_rule->load_config(_config.embed_sgd_param(), 1);
+
+  name = _config.embedx_sgd_param().name();
+  _embedx_sgd_rule = CREATE_PSCORE_CLASS(SparseValueSGDRule, name);
+  _embedx_sgd_rule->load_config(_config.embedx_sgd_param(),
+                                _config.embedx_dim());
+
+  common_feature_value.embed_sgd_dim = _embed_sgd_rule->dim();
+  common_feature_value.embedx_dim = _config.embedx_dim();
+  common_feature_value.embedx_sgd_dim = _embedx_sgd_rule->dim();
+  _show_click_decay_rate = _config.ctr_accessor_param().show_click_decay_rate();
+
+  return 0;
+}
+
+size_t CtrCommonAccessor::dim() { return common_feature_value.dim(); }
+
+size_t CtrCommonAccessor::dim_size(size_t dim) {
+  auto embedx_dim = _config.embedx_dim();
+  return common_feature_value.dim_size(dim, embedx_dim);
+}
+
+size_t CtrCommonAccessor::size() { return common_feature_value.size(); }
+
+size_t CtrCommonAccessor::mf_size() {
+  return (_config.embedx_dim() + common_feature_value.embedx_sgd_dim) *
+         sizeof(float);  // embedx embedx_g2sum
+}
+
+// pull value
+size_t CtrCommonAccessor::select_dim() {
+  auto embedx_dim = _config.embedx_dim();
+  return 1 + embedx_dim;
+}
+
+size_t CtrCommonAccessor::select_dim_size(size_t dim) { return sizeof(float); }
+
+size_t CtrCommonAccessor::select_size() { return select_dim() * sizeof(float); }
+
+// push value
+size_t CtrCommonAccessor::update_dim() {
+  auto embedx_dim = _config.embedx_dim();
+  return 4 + embedx_dim;
+}
+
+size_t CtrCommonAccessor::update_dim_size(size_t dim) { return sizeof(float); }
+
+size_t CtrCommonAccessor::update_size() { return update_dim() * sizeof(float); }
+
+bool CtrCommonAccessor::shrink(float* value) {
+  auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  auto delete_after_unseen_days =
+      _config.ctr_accessor_param().delete_after_unseen_days();
+  auto delete_threshold = _config.ctr_accessor_param().delete_threshold();
+
+  // time_decay first
+  common_feature_value.show(value) *= _show_click_decay_rate;
+  common_feature_value.click(value) *= _show_click_decay_rate;
+
+  // shrink after
+  auto score = show_click_score(common_feature_value.show(value),
+                                common_feature_value.click(value));
+  auto unseen_days = common_feature_value.unseen_days(value);
+  if (score < delete_threshold || unseen_days > delete_after_unseen_days) {
+    return true;
+  }
+  return false;
+}
+
+bool CtrCommonAccessor::save(float* value, int param) {
+  auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  auto delta_keep_days = _config.ctr_accessor_param().delta_keep_days();
+  if (param == 2) {
+    delta_threshold = 0;
+  }
+  switch (param) {
+    // save all
+    case 0: {
+      return true;
+    }
+    // save xbox delta
+    case 1:
+    // save xbox base
+    case 2: {
+      if (show_click_score(common_feature_value.show(value),
+                           common_feature_value.click(value)) >=
+              base_threshold &&
+          common_feature_value.delta_score(value) >= delta_threshold &&
+          common_feature_value.unseen_days(value) <= delta_keep_days) {
+        // do this after save, because it must not be modified when retry
+        if (param == 2) {
+          common_feature_value.delta_score(value) = 0;
+        }
+        return true;
+      } else {
+        return false;
+      }
+    }
+    // already decayed in shrink
+    case 3: {
+      // do this after save, because it must not be modified when retry
+      // common_feature_value.unseen_days(value)++;
+      return true;
+    }
+    // save revert batch_model
+    case 5: {
+      return true;
+    }
+    default:
+      return true;
+  }
+}
+
+void CtrCommonAccessor::update_stat_after_save(float* value, int param) {
+  auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  auto delta_keep_days = _config.ctr_accessor_param().delta_keep_days();
+  if (param == 2) {
+    delta_threshold = 0;
+  }
+  switch (param) {
+    case 1: {
+      if (show_click_score(common_feature_value.show(value),
+                           common_feature_value.click(value)) >=
+              base_threshold &&
+          common_feature_value.delta_score(value) >= delta_threshold &&
+          common_feature_value.unseen_days(value) <= delta_keep_days) {
+        common_feature_value.delta_score(value) = 0;
+      }
+    }
+      return;
+    case 3: {
+      common_feature_value.unseen_days(value)++;
+    }
+      return;
+    default:
+      return;
+  }
+}
+
+int32_t CtrCommonAccessor::create(float** values, size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* value = values[value_item];
+    value[common_feature_value.unseen_days_index()] = 0;
+    value[common_feature_value.delta_score_index()] = 0;
+    value[common_feature_value.show_index()] = 0;
+    value[common_feature_value.click_index()] = 0;
+    value[common_feature_value.slot_index()] = -1;
+    _embed_sgd_rule->init_value(
+        value + common_feature_value.embed_w_index(),
+        value + common_feature_value.embed_g2sum_index());
+    _embedx_sgd_rule->init_value(
+        value + common_feature_value.embedx_w_index(),
+        value + common_feature_value.embedx_g2sum_index(), false);
+  }
+  return 0;
+}
+
+bool CtrCommonAccessor::need_extend_mf(float* value) {
+  float show = value[common_feature_value.show_index()];
+  float click = value[common_feature_value.click_index()];
+  float score = (show - click) * _config.ctr_accessor_param().nonclk_coeff() +
+                click * _config.ctr_accessor_param().click_coeff();
+  return score >= _config.embedx_threshold();
+}
+
+bool CtrCommonAccessor::has_mf(size_t size) {
+  return size > common_feature_value.embedx_g2sum_index();
+}
+
+// from CommonFeatureValue to CtrCommonPullValue
+int32_t CtrCommonAccessor::select(float** select_values, const float** values,
+                                  size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* select_value = select_values[value_item];
+    const float* value = values[value_item];
+    select_value[CtrCommonPullValue::embed_w_index()] =
+        value[common_feature_value.embed_w_index()];
+    memcpy(select_value + CtrCommonPullValue::embedx_w_index(),
+           value + common_feature_value.embedx_w_index(),
+           embedx_dim * sizeof(float));
+  }
+  return 0;
+}
+
+// from CtrCommonPushValue to CtrCommonPushValue
+// first dim: item
+// second dim: field num
+int32_t CtrCommonAccessor::merge(float** update_values,
+                                 const float** other_update_values,
+                                 size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  size_t total_dim = CtrCommonPushValue::dim(embedx_dim);
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* update_value = update_values[value_item];
+    const float* other_update_value = other_update_values[value_item];
+    for (auto i = 0u; i < total_dim; ++i) {
+      if (i != CtrCommonPushValue::slot_index()) {
+        update_value[i] += other_update_value[i];
+      }
+    }
+  }
+  return 0;
+}
+
+// from CtrCommonPushValue to CommonFeatureValue
+// first dim: item
+// second dim: field num
+int32_t CtrCommonAccessor::update(float** update_values,
+                                  const float** push_values, size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* update_value = update_values[value_item];
+    const float* push_value = push_values[value_item];
+    float push_show = push_value[CtrCommonPushValue::show_index()];
+    float push_click = push_value[CtrCommonPushValue::click_index()];
+    float slot = push_value[CtrCommonPushValue::slot_index()];
+    update_value[common_feature_value.show_index()] += push_show;
+    update_value[common_feature_value.click_index()] += push_click;
+    update_value[common_feature_value.slot_index()] = slot;
+    update_value[common_feature_value.delta_score_index()] +=
+        (push_show - push_click) * _config.ctr_accessor_param().nonclk_coeff() +
+        push_click * _config.ctr_accessor_param().click_coeff();
+    update_value[common_feature_value.unseen_days_index()] = 0;
+    _embed_sgd_rule->update_value(
+        update_value + common_feature_value.embed_w_index(),
+        update_value + common_feature_value.embed_g2sum_index(),
+        push_value + CtrCommonPushValue::embed_g_index());
+    _embedx_sgd_rule->update_value(
+        update_value + common_feature_value.embedx_w_index(),
+        update_value + common_feature_value.embedx_g2sum_index(),
+        push_value + CtrCommonPushValue::embedx_g_index());
+  }
+  return 0;
+}
+
+bool CtrCommonAccessor::create_value(int stage, const float* value) {
+  // stage == 0, pull
+  // stage == 1, push
+  if (stage == 0) {
+    return true;
+  } else if (stage == 1) {
+    // operation
+    auto show = CtrCommonPushValue::show_const(value);
+    auto click = CtrCommonPushValue::click_const(value);
+    auto score = show_click_score(show, click);
+    if (score <= 0) {
+      return false;
+    }
+    if (score >= 1) {
+      return true;
+    }
+    return local_uniform_real_distribution<float>()(local_random_engine()) <
+           score;
+  } else {
+    return true;
+  }
+}
+
+float CtrCommonAccessor::show_click_score(float show, float click) {
+  auto nonclk_coeff = _config.ctr_accessor_param().nonclk_coeff();
+  auto click_coeff = _config.ctr_accessor_param().click_coeff();
+  return (show - click) * nonclk_coeff + click * click_coeff;
+}
+
+std::string CtrCommonAccessor::parse_to_string(const float* v, int param) {
+  thread_local std::ostringstream os;
+  os.clear();
+  os.str("");
+  os << v[0] << " " << v[1] << " " << v[2] << " " << v[3] << " " << v[4] << " "
+     << v[5];
+  for (int i = common_feature_value.embed_g2sum_index();
+       i < common_feature_value.embedx_w_index(); i++) {
+    os << " " << v[i];
+  }
+  auto show = common_feature_value.show_const(v);
+  auto click = common_feature_value.click_const(v);
+  auto score = show_click_score(show, click);
+  if (score >= _config.embedx_threshold()) {
+    for (auto i = common_feature_value.embedx_w_index();
+         i < common_feature_value.dim(); ++i) {
+      os << " " << v[i];
+    }
+  }
+  return os.str();
+}
+
+int CtrCommonAccessor::parse_from_string(const std::string& str, float* value) {
+  int embedx_dim = _config.embedx_dim();
+
+  _embedx_sgd_rule->init_value(
+      value + common_feature_value.embedx_w_index(),
+      value + common_feature_value.embedx_g2sum_index());
+  auto ret = paddle::string::str_to_float(str.data(), value);
+  CHECK(ret >= 6) << "expect more than 6 real:" << ret;
+  return ret;
+}
+
+}  // namespace distributed
+}  // namespace paddle
diff --git a/paddle/fluid/distributed/table/ctr_accessor.h b/paddle/fluid/distributed/table/ctr_accessor.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c2ac7189f777245aef4fcaabdb78b06c6540b3c
--- /dev/null
+++ b/paddle/fluid/distributed/table/ctr_accessor.h
@@ -0,0 +1,223 @@
+// Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include <stdint.h>
+#include <stdio.h>
+#include <vector>
+#include "paddle/fluid/distributed/common/registerer.h"
+#include "paddle/fluid/distributed/ps.pb.h"
+#include "paddle/fluid/distributed/table/accessor.h"
+#include "paddle/fluid/distributed/table/sparse_sgd_rule.h"
+
+namespace paddle {
+namespace distributed {
+
+class CtrCommonAccessor : public ValueAccessor {
+ public:
+  struct CtrCommonFeatureValue {
+    /*
+       float slot;
+       float unseen_days;
+       float delta_score;
+       float show;
+       float click;
+       float embed_w;
+       std::vector<float> embed_g2sum;
+       std::vector<float> embedx_w;
+       std::<vector>float embedx_g2sum;
+       */
+
+    int dim() { return 6 + embed_sgd_dim + embedx_sgd_dim + embedx_dim; }
+    int dim_size(size_t dim, int embedx_dim) { return sizeof(float); }
+    int size() { return dim() * sizeof(float); }
+    int slot_index() { return 0; }
+    int unseen_days_index() { return slot_index() + 1; }
+    int delta_score_index() { return unseen_days_index() + 1; }
+    int show_index() { return delta_score_index() + 1; }
+    int click_index() { return show_index() + 1; }
+    int embed_w_index() { return click_index() + 1; }
+    int embed_g2sum_index() { return embed_w_index() + 1; }
+    int embedx_w_index() { return embed_g2sum_index() + embed_sgd_dim; }
+    int embedx_g2sum_index() { return embedx_w_index() + embedx_dim; }
+
+    float& unseen_days(float* val) { return val[unseen_days_index()]; }
+    float& delta_score(float* val) { return val[delta_score_index()]; }
+    float& show(float* val) { return val[show_index()]; }
+    float& click(float* val) { return val[click_index()]; }
+    float& slot(float* val) { return val[slot_index()]; }
+    float& embed_w(float* val) { return val[embed_w_index()]; }
+    float& embed_g2sum(float* val) { return val[embed_g2sum_index()]; }
+    float& embedx_w(float* val) { return val[embedx_w_index()]; }
+    float& embedx_g2sum(float* val) { return val[embedx_g2sum_index()]; }
+    float show_const(const float* val) {
+      float s = val[show_index()];
+      return s;
+    }
+    float click_const(const float* val) {
+      float c = val[click_index()];
+      return c;
+    }
+    int embed_sgd_dim;
+    int embedx_dim;
+    int embedx_sgd_dim;
+  };
+
+  struct CtrCommonPushValue {
+    /*
+       float slot;
+       float show;
+       float click;
+       float embed_g;
+       std::vector<float> embedx_g;
+       */
+
+    static int dim(int embedx_dim) { return 4 + embedx_dim; }
+
+    static int dim_size(int dim, int embedx_dim) { return sizeof(float); }
+    static int size(int embedx_dim) { return dim(embedx_dim) * sizeof(float); }
+    static int slot_index() { return 0; }
+    static int show_index() { return CtrCommonPushValue::slot_index() + 1; }
+    static int click_index() { return CtrCommonPushValue::show_index() + 1; }
+    static int embed_g_index() { return CtrCommonPushValue::click_index() + 1; }
+    static int embedx_g_index() {
+      return CtrCommonPushValue::embed_g_index() + 1;
+    }
+    static float& slot(float* val) {
+      return val[CtrCommonPushValue::slot_index()];
+    }
+    static float& show(float* val) {
+      return val[CtrCommonPushValue::show_index()];
+    }
+    static float& click(float* val) {
+      return val[CtrCommonPushValue::click_index()];
+    }
+    static float show_const(const float* val) {
+      float s = val[show_index()];
+      return s;
+    }
+    static float click_const(const float* val) {
+      float c = val[click_index()];
+      return c;
+    }
+    static float& embed_g(float* val) {
+      return val[CtrCommonPushValue::embed_g_index()];
+    }
+    static float* embedx_g(float* val) {
+      return val + CtrCommonPushValue::embedx_g_index();
+    }
+  };
+
+  struct CtrCommonPullValue {
+    /*
+       float embed_w;
+       std::vector<float> embedx_w;
+       */
+
+    static int dim(int embedx_dim) { return 1 + embedx_dim; }
+    static int dim_size(size_t dim) { return sizeof(float); }
+    static int size(int embedx_dim) { return dim(embedx_dim) * sizeof(float); }
+    static int embed_w_index() { return 0; }
+    static int embedx_w_index() { return 1; }
+    static float& embed_w(float* val) {
+      return val[CtrCommonPullValue::embed_w_index()];
+    }
+    static float* embedx_w(float* val) {
+      return val + CtrCommonPullValue::embedx_w_index();
+    }
+  };
+  CtrCommonAccessor() {}
+  virtual int initialize();
+  virtual ~CtrCommonAccessor() {}
+
+  // value维度
+  virtual size_t dim();
+  // value各个维度的size
+  virtual size_t dim_size(size_t dim);
+  // value各维度相加总size
+  virtual size_t size();
+  // value中mf动态长度部分总size大小, sparse下生效
+  virtual size_t mf_size();
+  // pull value维度
+  virtual size_t select_dim();
+  // pull value各个维度的size
+  virtual size_t select_dim_size(size_t dim);
+  // pull value各维度相加总size
+  virtual size_t select_size();
+  // push value维度
+  virtual size_t update_dim();
+  // push value各个维度的size
+  virtual size_t update_dim_size(size_t dim);
+  // push value各维度相加总size
+  virtual size_t update_size();
+  // 判断该value是否进行shrink
+  virtual bool shrink(float* value);
+  // 判断该value是否保存到ssd
+  // virtual bool save_ssd(float* value);
+  virtual bool need_extend_mf(float* value);
+  virtual bool has_mf(size_t size);
+  // 判断该value是否在save阶段dump,
+  // param作为参数用于标识save阶段，如downpour的xbox与batch_model
+  // param = 0, save all feature
+  // param = 1, save delta feature
+  // param = 2, save xbox base feature
+  bool save(float* value, int param) override;
+  // update delta_score and unseen_days after save
+  void update_stat_after_save(float* value, int param) override;
+  // keys不存在时，为values生成随机值
+  // 要求value的内存由外部调用者分配完毕
+  virtual int32_t create(float** value, size_t num);
+  // 从values中选取到select_values中
+  virtual int32_t select(float** select_values, const float** values,
+                         size_t num);
+  // 将update_values聚合到一起
+  virtual int32_t merge(float** update_values,
+                        const float** other_update_values, size_t num);
+  // 将update_values聚合到一起，通过it.next判定是否进入下一个key
+  // virtual int32_t merge(float** update_values, iterator it);
+  // 将update_values更新应用到values中
+  virtual int32_t update(float** values, const float** update_values,
+                         size_t num);
+
+  std::string parse_to_string(const float* value, int param) override;
+  int32_t parse_from_string(const std::string& str, float* v) override;
+  virtual bool create_value(int type, const float* value);
+
+  // 这个接口目前只用来取show
+  float get_field(float* value, const std::string& name) override {
+    // CHECK(name == "show");
+    if (name == "show") {
+      return common_feature_value.show(value);
+    }
+    return 0.0;
+  }
+
+ private:
+  // float show_click_score(float show, float click);
+
+  // SparseValueSGDRule* _embed_sgd_rule;
+  // SparseValueSGDRule* _embedx_sgd_rule;
+  // CtrCommonFeatureValue common_feature_value;
+  float _show_click_decay_rate;
+  int32_t _ssd_unseenday_threshold;
+
+ public:  // TODO(zhaocaibei123): it should be private, but we make it public
+          // for unit test
+  CtrCommonFeatureValue common_feature_value;
+  float show_click_score(float show, float click);
+  SparseValueSGDRule* _embed_sgd_rule;
+  SparseValueSGDRule* _embedx_sgd_rule;
+};
+}  // namespace distributed
+}  // namespace paddle
diff --git a/paddle/fluid/distributed/test/CMakeLists.txt b/paddle/fluid/distributed/test/CMakeLists.txt
index 832797ec2fc0eeaa22017838e63c319105cac67a..f8cd9af4774ec5a6fd3f4bfaed71f7009a6f8743 100644
--- a/paddle/fluid/distributed/test/CMakeLists.txt
+++ b/paddle/fluid/distributed/test/CMakeLists.txt
@@ -26,3 +26,6 @@ cc_test(feature_value_test SRCS feature_value_test.cc DEPS ${COMMON_DEPS} boost
 
 set_source_files_properties(sparse_sgd_rule_test.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 cc_test(sparse_sgd_rule_test SRCS sparse_sgd_rule_test.cc DEPS ${COMMON_DEPS} boost table)
+
+set_source_files_properties(ctr_accessor_test.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
+cc_test(ctr_accessor_test SRCS ctr_accessor_test.cc DEPS ${COMMON_DEPS} boost table)
diff --git a/paddle/fluid/distributed/test/ctr_accessor_test.cc b/paddle/fluid/distributed/test/ctr_accessor_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8c667cad605fcc6b581d91ebbb6e2be812e1d1be
--- /dev/null
+++ b/paddle/fluid/distributed/test/ctr_accessor_test.cc
@@ -0,0 +1,304 @@
+/* Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/fluid/distributed/table/ctr_accessor.h"
+#include <cmath>
+#include <iostream>
+#include "gtest/gtest.h"
+#include "paddle/fluid/distributed/common/registerer.h"
+#include "paddle/fluid/distributed/ps.pb.h"
+#include "paddle/fluid/distributed/table/sparse_sgd_rule.h"
+
+namespace paddle {
+namespace distributed {
+REGISTER_PSCORE_CLASS(SparseValueSGDRule, SparseAdaGradSGDRule);
+REGISTER_PSCORE_CLASS(SparseValueSGDRule, StdAdaGradSGDRule);
+REGISTER_PSCORE_CLASS(SparseValueSGDRule, SparseAdamSGDRule);
+REGISTER_PSCORE_CLASS(SparseValueSGDRule, SparseNaiveSGDRule);
+
+TableAccessorParameter gen_param() {
+  TableAccessorParameter param;
+  param.set_accessor_class("CtrCommonAccessor");
+  param.set_fea_dim(11);
+  param.set_embedx_dim(8);
+  param.mutable_ctr_accessor_param()->set_nonclk_coeff(0.2);
+  param.mutable_ctr_accessor_param()->set_click_coeff(1);
+  param.mutable_ctr_accessor_param()->set_base_threshold(0.5);
+  param.mutable_ctr_accessor_param()->set_delta_threshold(0.2);
+  param.mutable_ctr_accessor_param()->set_delta_keep_days(16);
+  param.mutable_ctr_accessor_param()->set_show_click_decay_rate(0.99);
+  /*
+  param.mutable_embed_sgd_param()->set_name("naive");
+  auto* naive_param = param.mutable_embed_sgd_param()->mutable_naive();
+  naive_param->set_learning_rate(0.1);
+  naive_param->set_initial_range(0.3);
+  naive_param->add_weight_bounds(-10.0);
+  naive_param->add_weight_bounds(10.0);
+  */
+  param.mutable_embed_sgd_param()->set_name("StdAdaGradSGDRule");
+  auto* adagrad_param = param.mutable_embed_sgd_param()->mutable_adagrad();
+  adagrad_param->set_learning_rate(0.1);
+  adagrad_param->set_initial_range(0.3);
+  adagrad_param->set_initial_g2sum(0.0);
+  adagrad_param->add_weight_bounds(-10.0);
+  adagrad_param->add_weight_bounds(10.0);
+
+  param.mutable_embedx_sgd_param()->set_name("SparseNaiveSGDRule");
+  auto* naive_param = param.mutable_embedx_sgd_param()->mutable_naive();
+  naive_param->set_learning_rate(0.1);
+  naive_param->set_initial_range(0.3);
+  naive_param->add_weight_bounds(-10.0);
+  naive_param->add_weight_bounds(10.0);
+
+  return std::move(param);
+}
+
+TEST(downpour_feature_value_accessor_test, test_shrink) {
+  TableAccessorParameter parameter = gen_param();
+  CtrCommonAccessor* acc = new CtrCommonAccessor();
+  ASSERT_EQ(acc->configure(parameter), 0);
+  ASSERT_EQ(acc->initialize(), 0);
+
+  VLOG(3) << "size of struct: " << acc->common_feature_value.embed_sgd_dim
+          << " " << acc->common_feature_value.embedx_dim << " "
+          << acc->common_feature_value.embedx_sgd_dim << " "
+          << acc->common_feature_value.dim() << "\n";
+
+  float* value = new float[acc->dim()];
+  for (auto i = 0u; i < acc->dim(); ++i) {
+    value[i] = i * 1.0;
+  }
+  ASSERT_TRUE(!acc->shrink(value));
+
+  // set unseen_days too long
+  value[1] = 1000;
+  // set delta score too small
+  value[2] = 0.001;
+  ASSERT_TRUE(acc->shrink(value));
+}
+
+TEST(downpour_feature_value_accessor_test, test_save) {
+  TableAccessorParameter parameter = gen_param();
+  CtrCommonAccessor* acc = new CtrCommonAccessor();
+  ASSERT_EQ(acc->configure(parameter), 0);
+  ASSERT_EQ(acc->initialize(), 0);
+
+  float* value = new float[acc->dim()];
+  for (auto i = 0u; i < acc->dim(); ++i) {
+    value[i] = i * 1.0;
+  }
+
+  // save all feature
+  ASSERT_TRUE(acc->save(value, 0));
+
+  // save delta feature
+  ASSERT_TRUE(acc->save(value, 1));
+
+  // save base feature with time decay
+  ASSERT_TRUE(acc->save(value, 2));
+
+  VLOG(3) << "test_save:";
+  for (auto i = 0u; i < acc->dim(); ++i) {
+    VLOG(3) << value[i];
+  }
+}
+
+TEST(downpour_feature_value_accessor_test, test_create) {
+  TableAccessorParameter parameter = gen_param();
+  CtrCommonAccessor* acc = new CtrCommonAccessor();
+  ASSERT_EQ(acc->configure(parameter), 0);
+  ASSERT_EQ(acc->initialize(), 0);
+
+  const int field_size = 7 + 8;
+  const int item_size = 10;
+
+  float** value = new float*[item_size];
+  for (auto i = 0u; i < item_size; ++i) {
+    value[i] = new float[field_size];
+  }
+  ASSERT_EQ(acc->create(value, item_size), 0);
+
+  for (auto i = 0u; i < item_size; ++i) {
+    for (auto j = 0u; j < field_size; ++j) {
+      VLOG(3) << value[i][j] << " ";
+      // ASSERT_FLOAT_EQ(value[i][j], 0);
+    }
+    VLOG(3) << "\n";
+  }
+}
+
+TEST(downpour_feature_value_accessor_test, test_update) {
+  TableAccessorParameter parameter = gen_param();
+  CtrCommonAccessor* acc = new CtrCommonAccessor();
+  ASSERT_EQ(acc->configure(parameter), 0);
+  ASSERT_EQ(acc->initialize(), 0);
+
+  VLOG(3) << "dim: " << acc->common_feature_value.dim() << "\n";
+  VLOG(3) << "update_dim: " << acc->update_dim() << "\n";
+
+  const int field_size = 7 + 8;
+  const int item_size = 10;
+
+  float** value = new float*[item_size];
+  for (auto i = 0u; i < item_size; ++i) {
+    value[i] = new float[field_size];
+
+    for (auto j = 0u; j < field_size; ++j) {
+      value[i][j] = 0;
+    }
+  }
+
+  typedef const float* const_float_ptr;
+  const_float_ptr* grad = new const_float_ptr[item_size];
+  for (auto i = 0u; i < item_size; ++i) {
+    float* p = new float[acc->update_dim()];
+    for (auto j = 0u; j < acc->update_dim(); ++j) {
+      p[j] = i;
+    }
+    grad[i] = p;
+  }
+
+  struct DownpourSparseValueTest {
+    float slot;
+    float unseen_days;
+    float delta_score;
+    float show;
+    float click;
+    float embed_w;
+    std::vector<float> embed_g2sum;
+    std::vector<float> embedx_w;
+    std::vector<float> embedx_g2sum;
+
+    void to_array(float* ptr, size_t dim) {
+      ptr[0] = slot;
+      ptr[1] = unseen_days;
+      ptr[2] = delta_score;
+      ptr[3] = show;
+      ptr[4] = click;
+      ptr[5] = embed_w;
+      int idx = 6;
+      for (auto j = 0u; j < 1; ++j) {
+        ptr[idx + j] = embed_g2sum[j];
+      }
+      idx += 1;
+      for (auto j = 0u; j < 8; ++j) {
+        ptr[idx + j] = embedx_w[j];
+      }
+      idx += 8;
+      for (auto j = 0u; j < 0; ++j) {
+        ptr[idx + j] = embedx_g2sum[j];
+      }
+    }
+  };
+  struct DownpourSparsePushValueTest {
+    float slot;
+    float show;
+    float click;
+    float embed_g;
+    std::vector<float> embedx_g;
+  };
+  std::vector<float*> exp_value;
+  for (auto i = 0u; i < item_size; ++i) {
+    DownpourSparseValueTest v;
+    v.slot = value[i][0];
+    v.unseen_days = value[i][1];
+    v.delta_score = value[i][2];
+    v.show = value[i][3];
+    v.click = value[i][4];
+    v.embed_w = value[i][5];
+
+    int idx = 6;
+    for (auto j = 0u; j < acc->common_feature_value.embed_sgd_dim; ++j) {
+      v.embed_g2sum.push_back(value[i][idx + j]);
+    }
+    idx += acc->common_feature_value.embed_sgd_dim;
+    for (auto j = 0u; j < acc->common_feature_value.embedx_dim; ++j) {
+      v.embedx_w.push_back(value[i][idx + j]);
+    }
+    idx += acc->common_feature_value.embedx_dim;
+    for (auto j = 0u; j < acc->common_feature_value.embedx_sgd_dim; ++j) {
+      v.embedx_g2sum.push_back(value[i][idx + j]);
+    }
+
+    DownpourSparsePushValueTest push_v;
+    push_v.slot = grad[i][0];
+    push_v.show = grad[i][1];
+    push_v.click = grad[i][2];
+    push_v.embed_g = grad[i][3];
+    for (auto j = 0; j < parameter.embedx_dim(); ++j) {
+      push_v.embedx_g.push_back(grad[i][4 + j]);
+    }
+
+    v.slot = push_v.slot;
+    v.unseen_days = 0;
+    v.show += push_v.show;
+    v.click += push_v.click;
+    v.delta_score += acc->show_click_score(push_v.show, push_v.click);
+
+    acc->_embed_sgd_rule->update_value(&v.embed_w, &v.embed_g2sum[0],
+                                       &push_v.embed_g);
+    acc->_embedx_sgd_rule->update_value(&v.embedx_w[0], &v.embedx_g2sum[0],
+                                        &push_v.embedx_g[0]);
+
+    float* ptr = new float[acc->dim()];
+    v.to_array(ptr, parameter.embedx_dim());
+    exp_value.push_back(ptr);
+  }
+  acc->update(value, grad, item_size);
+
+  for (auto i = 0u; i < item_size; ++i) {
+    for (auto j = 0u; j < acc->dim(); ++j) {
+      VLOG(3) << value[i][j] << ":" << exp_value[i][j] << " ";
+      ASSERT_FLOAT_EQ(value[i][j], exp_value[i][j]);
+    }
+  }
+}
+
+TEST(downpour_feature_value_accessor_test, test_show_click_score) {
+  TableAccessorParameter parameter = gen_param();
+  CtrCommonAccessor* acc = new CtrCommonAccessor();
+  ASSERT_EQ(acc->configure(parameter), 0);
+  ASSERT_EQ(acc->initialize(), 0);
+
+  float show = 10;
+  float click = 6;
+  ASSERT_FLOAT_EQ(acc->show_click_score(show, click), 6.8);
+}
+
+TEST(downpour_feature_value_accessor_test, test_string_related) {
+  TableAccessorParameter parameter = gen_param();
+  CtrCommonAccessor* acc = new CtrCommonAccessor();
+  ASSERT_EQ(acc->configure(parameter), 0);
+  ASSERT_EQ(acc->initialize(), 0);
+
+  const int field_size = 15;
+  float* value = new float[field_size];
+  for (auto i = 0u; i < field_size; ++i) {
+    value[i] = i;
+  }
+
+  auto str = acc->parse_to_string(value, 0);
+
+  VLOG(3) << str << std::endl;
+
+  str = "0 1 2 3 4 5 6";
+  ASSERT_NE(acc->parse_from_string(str, value), 0);
+  // make sure init_zero=true
+
+  for (auto i = 7; i < 15; ++i) {
+    ASSERT_FLOAT_EQ(value[i], 0);
+  }
+}
+}  // namespace distributed
+}  // namespace paddle
diff --git a/paddle/fluid/string/string_helper.cc b/paddle/fluid/string/string_helper.cc
index 141ac2ba47c5b9cbd3f4c4ba2bddf4657349ce6f..db9ee7592fc84237e760d94a3ebb3eff328a8309 100644
--- a/paddle/fluid/string/string_helper.cc
+++ b/paddle/fluid/string/string_helper.cc
@@ -24,26 +24,6 @@
 namespace paddle {
 namespace string {
 
-inline size_t count_spaces(const char* s) {
-  size_t count = 0;
-
-  while (*s != 0 && isspace(*s++)) {
-    count++;
-  }
-
-  return count;
-}
-
-inline size_t count_nonspaces(const char* s) {
-  size_t count = 0;
-
-  while (*s != 0 && !isspace(*s++)) {
-    count++;
-  }
-
-  return count;
-}
-
 // remove leading and tailing spaces
 std::string trim_spaces(const std::string& str) {
   const char* p = str.c_str();
@@ -74,20 +54,6 @@ std::string erase_spaces(const std::string& str) {
   return result;
 }
 
-inline int str_to_float(const char* str, float* v) {
-  const char* head = str;
-  char* cursor = NULL;
-  int index = 0;
-  while (*(head += count_spaces(head)) != 0) {
-    v[index++] = std::strtof(head, &cursor);
-    if (head == cursor) {
-      break;
-    }
-    head = cursor;
-  }
-  return index;
-}
-
 bool ends_with(std::string const& input, std::string const& test) {
   if (test.size() > input.size()) return false;
   return std::equal(test.rbegin(), test.rend(), input.rbegin());
diff --git a/paddle/fluid/string/string_helper.h b/paddle/fluid/string/string_helper.h
index 1ab7690f8b517baed1a6e8dd8dbec74bba83a1f9..4f1aee7c7ed17fd454e1965b7bc53a7d27a44a3f 100644
--- a/paddle/fluid/string/string_helper.h
+++ b/paddle/fluid/string/string_helper.h
@@ -26,9 +26,25 @@
 namespace paddle {
 namespace string {
 
-inline size_t count_spaces(const char* s);
+inline size_t count_spaces(const char* s) {
+  size_t count = 0;
 
-inline size_t count_nonspaces(const char* s);
+  while (*s != 0 && isspace(*s++)) {
+    count++;
+  }
+
+  return count;
+}
+
+inline size_t count_nonspaces(const char* s) {
+  size_t count = 0;
+
+  while (*s != 0 && !isspace(*s++)) {
+    count++;
+  }
+
+  return count;
+}
 
 template <class... ARGS>
 void format_string_append(std::string& str, const char* fmt,  // NOLINT
@@ -67,7 +83,19 @@ std::string trim_spaces(const std::string& str);
 // erase all spaces in str
 std::string erase_spaces(const std::string& str);
 
-int str_to_float(const char* str, float* v);
+inline int str_to_float(const char* str, float* v) {
+  const char* head = str;
+  char* cursor = NULL;
+  int index = 0;
+  while (*(head += count_spaces(head)) != 0) {
+    v[index++] = std::strtof(head, &cursor);
+    if (head == cursor) {
+      break;
+    }
+    head = cursor;
+  }
+  return index;
+}
 
 // checks whether the test string is a suffix of the input string.
 bool ends_with(std::string const& input, std::string const& test);