diff --git a/paddle/framework/op_registry.h b/paddle/framework/op_registry.h
index 41bdb65f8e9bbbf63ec6e62e8c2243cc3d6f21de..a84364301a8f72f93f698226fd1c91b3d0e37f96 100644
--- a/paddle/framework/op_registry.h
+++ b/paddle/framework/op_registry.h
@@ -216,21 +216,32 @@ class OpRegistry {
   static OperatorPtr CreateOp(const OpDesc& op_desc) {
     std::string op_type = op_desc.type();
     OperatorPtr op(creators().at(op_type)());
+    const OpProto& op_proto = protos().at(op_type);
+    // set op's inputs_ from desc.
     op->type_ = op_desc.type();
     op->inputs_.reserve((size_t)op_desc.inputs_size());
     std::copy(op_desc.inputs().begin(), op_desc.inputs().end(),
               std::back_inserter(op->inputs_));
+    // set op's outputs_ from desc.
     op->outputs_.reserve((size_t)op_desc.outputs_size());
     std::copy(op_desc.outputs().begin(), op_desc.outputs().end(),
               std::back_inserter(op->outputs_));
+    // set op's attr;
     for (auto& attr : op_desc.attrs()) {
       op->attrs_[attr.name()] = AttrTypeHelper::GetAttrValue(attr);
     }
     op_checkers().at(op_type).Check(op->attrs_);
+    // set argument offsets stored in op.
+    CreateInOutOffsetMap(op, op_proto);
     op->Init();
     return op;
   }
 
+  // init op.in_out_idxs_ to accelerate argument's offset lookup.
+  static void CreateInOutOffsetMap(OperatorPtr op, const OpProto& proto) {
+    op->CreateInOutOffsetMap(proto);
+  }
+
   static std::unordered_map<std::string, OpProto>& protos() {
     static std::unordered_map<std::string, OpProto> protos_;
     return protos_;
diff --git a/paddle/framework/operator.cc b/paddle/framework/operator.cc
index 7756162a872db6de3f932a09e4b7525a2fde70da..58a34fca0f62237b7bd5f46bd39de470aa4ebfc8 100644
--- a/paddle/framework/operator.cc
+++ b/paddle/framework/operator.cc
@@ -12,11 +12,69 @@ 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 <algorithm>
+
 #include "paddle/framework/operator.h"
 
 namespace paddle {
 namespace framework {
 
+void OperatorBase::CreateInOutOffsetMap(const OpProto& proto) {
+  PADDLE_ENFORCE(in_out_idxs_.empty(), "duplicate call CreateInOutOffsetMap");
+  for (int i = 0; i < proto.inputs_size(); i++) {
+    const auto& name = proto.inputs()[i].name();
+    in_out_idxs_[name] = i;
+  }
+  for (int i = 0; i < proto.outputs_size(); i++) {
+    const auto& name = proto.outputs()[i].name();
+    in_out_idxs_[name] = i;
+  }
+}
+
+const std::string& OperatorBase::Input(const std::string& name) const {
+  auto it = in_out_idxs_.find(name);
+  PADDLE_ENFORCE(it != in_out_idxs_.end(), "no key [%s] in in_out_idxs_", name);
+
+  if (attrs_.count("input_format") == 0) {
+    return inputs_[it->second];
+  } else {
+    const auto& input_format = GetAttr<std::vector<int>>("input_format");
+    int idx = input_format[it->second];
+    return inputs_.at(idx);
+  }
+}
+
+std::vector<std::string> OperatorBase::Inputs(const std::string& name) const {
+  auto input_format = GetAttr<std::vector<int>>("input_format");
+  auto offset = in_out_idxs_.at(name);
+
+  return std::vector<std::string>{
+      inputs_.begin() + input_format.at(offset),
+      inputs_.begin() + input_format.at(offset + 1)};
+}
+
+const std::string& OperatorBase::Output(const std::string& name) const {
+  auto it = in_out_idxs_.find(name);
+  PADDLE_ENFORCE(it != in_out_idxs_.end(), "no key [%s] in in_out_idxs_", name);
+
+  if (attrs_.count("output_format") == 0) {
+    return outputs_[it->second];
+  } else {
+    const auto& output_format = GetAttr<std::vector<int>>("output_format");
+    int idx = output_format[it->second];
+    return outputs_.at(idx);
+  }
+}
+
+std::vector<std::string> OperatorBase::Outputs(const std::string& name) const {
+  auto output_format = GetAttr<std::vector<int>>("output_format");
+  auto offset = in_out_idxs_.at(name);
+
+  return std::vector<std::string>{
+      outputs_.begin() + output_format.at(offset),
+      outputs_.begin() + output_format.at(offset + 1)};
+}
+
 std::string OperatorBase::DebugString() const {
   std::stringstream ss;
   ss << "=================\n";
diff --git a/paddle/framework/operator.h b/paddle/framework/operator.h
index f7ed6e9f3d9422dd719721d4c3ab6b21d4e50e2d..6567950ce5ff9482c1729b5269ac5db70bf234c8 100644
--- a/paddle/framework/operator.h
+++ b/paddle/framework/operator.h
@@ -14,18 +14,20 @@ limitations under the License. */
 
 #pragma once
 
-#include <paddle/framework/attr_checker.h>
-#include <paddle/framework/op_desc.pb.h>
-#include <paddle/framework/scope.h>
-#include <paddle/framework/tensor.h>
-#include <paddle/platform/device_context.h>
-#include <paddle/platform/place.h>
-#include <paddle/utils/Error.h>
 #include <boost/variant.hpp>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
+#include "paddle/framework/attr_checker.h"
+#include "paddle/framework/op_desc.pb.h"
+#include "paddle/framework/op_proto.pb.h"
+#include "paddle/framework/scope.h"
+#include "paddle/framework/tensor.h"
+#include "paddle/platform/device_context.h"
+#include "paddle/platform/place.h"
+#include "paddle/utils/Error.h"
+
 namespace paddle {
 namespace framework {
 
@@ -62,11 +64,72 @@ class OperatorBase {
   virtual void Run(const ScopePtr& scope,
                    const platform::DeviceContext& dev_ctx) const = 0;
 
+  // Get a input with argument's name described in `op_proto`
+  const std::string& Input(const std::string& name) const;
+  // Get a input which has multiple variables.
+  // TODO add a vector_view to prevent memory copy.
+  std::vector<std::string> Inputs(const std::string& name) const;
+  // Get a output with argument's name described in `op_proto`
+  const std::string& Output(const std::string& name) const;
+  // Get an output which has multiple variables.
+  // TODO add a vector_view to prevent memory copy.
+  std::vector<std::string> Outputs(const std::string& name) const;
+
+  // init in_out_idxs_ to accelerate argument's offset lookup.
+  void CreateInOutOffsetMap(const OpProto& proto);
+
  public:
   std::string type_;
   std::vector<std::string> inputs_;
   std::vector<std::string> outputs_;
   AttributeMap attrs_;
+  // store the arguments' offset described in op_desc.
+  std::unordered_map<std::string, int> in_out_idxs_;
+};
+
+class KernelContext {
+ public:
+  KernelContext(const OperatorBase* op, const std::shared_ptr<Scope>& scope,
+                const platform::DeviceContext& device_context)
+      : op_(*op), scope_(scope), device_context_(device_context) {}
+
+  const Variable* Input(int index) const {
+    return scope_->GetVariable(op_.inputs_[index]);
+  }
+
+  Variable* Output(int index) const {
+    return scope_->GetVariable(op_.outputs_[index]);
+  }
+
+  const Variable* Input(const std::string& name) const {
+    return scope_->GetVariable(op_.Input(name));
+  }
+
+  const Variable* Output(const std::string& name) const {
+    return scope_->GetVariable(op_.Output(name));
+  }
+
+  const std::vector<const Variable*> Inputs(const std::string& name) const {
+    auto names = op_.Inputs(name);
+    std::vector<const Variable*> res;
+    std::transform(
+        names.begin(), names.end(), res.begin(),
+        [this](const std::string& name) { return scope_->GetVariable(name); });
+    return res;
+  }
+
+  const std::vector<const Variable*> Outputs(const std::string& name) const {
+    auto names = op_.Outputs(name);
+    std::vector<const Variable*> res;
+    std::transform(
+        names.begin(), names.end(), res.begin(),
+        [this](const std::string& name) { return scope_->GetVariable(name); });
+    return res;
+  }
+
+  const OperatorBase& op_;
+  const std::shared_ptr<Scope>& scope_;
+  const platform::DeviceContext& device_context_;
 };
 
 class OpKernel {
@@ -77,25 +140,6 @@ class OpKernel {
    * device resource such as CUDA stream, cublas handle, etc. from
    * KernelContext. User should construct it before run the Operator.
    */
-  class KernelContext {
-   public:
-    KernelContext(const OperatorBase* op, const ScopePtr& scope,
-                  const platform::DeviceContext& device_context)
-        : op_(*op), scope_(scope), device_context_(device_context) {}
-
-    const Variable* Input(int index) const {
-      return scope_->GetVariable(op_.inputs_[index]);
-    }
-
-    Variable* Output(int index) const {
-      return scope_->GetVariable(op_.outputs_[index]);
-    }
-
-    const OperatorBase& op_;
-    const ScopePtr& scope_;
-    const platform::DeviceContext& device_context_;
-  };
-
   virtual void Compute(const KernelContext& context) const = 0;
 
   virtual ~OpKernel() {}
@@ -140,7 +184,7 @@ class OperatorWithKernel : public OperatorBase {
   void Run(const ScopePtr& scope,
            const platform::DeviceContext& dev_ctx) const final {
     auto& opKernel = AllOpKernels().at(type_).at(OpKernelKey(dev_ctx));
-    opKernel->Compute(OpKernel::KernelContext(this, scope, dev_ctx));
+    opKernel->Compute(KernelContext(this, scope, dev_ctx));
   }
 
   static std::unordered_map<std::string /* op_type */, OpKernelMap>&
@@ -148,6 +192,7 @@ class OperatorWithKernel : public OperatorBase {
     static std::unordered_map<std::string, OpKernelMap> g_all_op_kernels;
     return g_all_op_kernels;
   }
+
   void InferShape(const std::shared_ptr<Scope>& scope) const final {
     std::vector<const Tensor*> ins;
     VarNamesToTensors(scope, inputs_, &ins);
diff --git a/paddle/framework/operator_test.cc b/paddle/framework/operator_test.cc
index 19ac4ecafa21d0a6fde57ef5e867670d7823fde0..6fa110f94ccc0c0a2f2e61316aa5dc271631a11c 100644
--- a/paddle/framework/operator_test.cc
+++ b/paddle/framework/operator_test.cc
@@ -30,7 +30,6 @@ class OpWithoutKernelTest : public OperatorBase {
     op_run_num++;
     ASSERT_EQ((int)inputs_.size(), 1);
     ASSERT_EQ((int)outputs_.size(), 1);
-    ASSERT_NEAR(GetAttr<float>("scale"), 3.14, 1e-5);
     ASSERT_EQ(scope->GetVariable(inputs_[0]), nullptr);
     ASSERT_EQ(x, 1);
     ASSERT_NE(scope->GetVariable(outputs_[0]), nullptr);
@@ -86,9 +85,11 @@ class OpKernelTestProtoAndCheckerMaker : public OpProtoAndCheckerMaker {
  public:
   OpKernelTestProtoAndCheckerMaker(OpProto* proto, OpAttrChecker* op_checker)
       : OpProtoAndCheckerMaker(proto, op_checker) {
-    AddInput("input", "input of test op");
-    AddOutput("output", "output of test op");
-    AddAttr<float>("scale", "scale of cosine op");
+    AddInput("x", "input of test op");
+    AddOutput("y", "output of test op");
+    AddAttr<float>("scale", "scale of cosine op")
+        .SetDefault(1.0)
+        .LargerThan(0.0);
     AddComment("This is test op");
   }
 };
@@ -103,11 +104,65 @@ class OpWithKernelTest : public OperatorWithKernel {
 
 class CPUKernelTest : public OpKernel {
  public:
-  void Compute(const KernelContext& context) const {
+  void Compute(const KernelContext& ctx) const {
+    std::cout << "this is cpu kernel" << std::endl;
+    std::cout << ctx.op_.DebugString() << std::endl;
     cpu_kernel_run_num++;
-    ASSERT_EQ((int)context.op_.inputs_.size(), 1);
-    ASSERT_EQ((int)context.op_.outputs_.size(), 1);
-    ASSERT_NEAR(context.op_.GetAttr<float>("scale"), 3.14, 1e-5);
+    ASSERT_EQ(ctx.op_.Input("x"), "IN1");
+    ASSERT_EQ(ctx.op_.Output("y"), "OUT1");
+  }
+};
+
+// multiple inputs test
+class OperatorMultiInputsTest : public OperatorBase {
+ public:
+  void Init() override { x = 1; }
+  void InferShape(const std::shared_ptr<Scope>& scope) const override {}
+  void Run(const std::shared_ptr<Scope>& scope,
+           const platform::DeviceContext& dev_ctx) const override {
+    ASSERT_EQ(scope->GetVariable(inputs_[0]), nullptr);
+    ASSERT_EQ(x, 1);
+    ASSERT_NE(scope->GetVariable(outputs_[0]), nullptr);
+    ASSERT_EQ(Input("x"), "IN1");
+    ASSERT_EQ(Input("y"), "OUT1");
+  }
+
+ public:
+  float x = 0;
+};
+
+class OpKernelTestMultiInputsProtoAndCheckerMaker
+    : public OpProtoAndCheckerMaker {
+ public:
+  OpKernelTestMultiInputsProtoAndCheckerMaker(OpProto* proto,
+                                              OpAttrChecker* op_checker)
+      : OpProtoAndCheckerMaker(proto, op_checker) {
+    AddInputs("xs", "inputs of test op");
+    AddInput("k", "input of test op");
+    AddOutputs("ys", "outputs of test op");
+    AddAttr<float>("scale", "scale of cosine op")
+        .SetDefault(1.0)
+        .LargerThan(0.0);
+    AddComment("This is test op");
+  }
+};
+
+class CPUKernalMultiInputsTest : public OpKernel {
+ public:
+  void Compute(const KernelContext& ctx) const {
+    auto xs = ctx.op_.Inputs("xs");
+    ASSERT_EQ(xs.size(), 3UL);
+    ASSERT_EQ(xs[0], "x0");
+    ASSERT_EQ(xs[1], "x1");
+    ASSERT_EQ(xs[2], "x2");
+
+    auto k = ctx.op_.Input("k");
+    ASSERT_EQ(k, "k0");
+
+    auto ys = ctx.op_.Outputs("ys");
+    ASSERT_EQ(ys.size(), 2UL);
+    ASSERT_EQ(ys[0], "y0");
+    ASSERT_EQ(ys[1], "y1");
   }
 };
 
@@ -118,6 +173,7 @@ REGISTER_OP(op_with_kernel, paddle::framework::OpWithKernelTest,
             paddle::framework::OpKernelTestProtoAndCheckerMaker);
 REGISTER_OP_CPU_KERNEL(op_with_kernel, paddle::framework::CPUKernelTest);
 
+// test with single input
 TEST(OpKernel, all) {
   paddle::framework::OpDesc op_desc;
   op_desc.set_type("op_with_kernel");
@@ -137,3 +193,47 @@ TEST(OpKernel, all) {
   op->Run(scope, cpu_device_context);
   ASSERT_EQ(paddle::framework::cpu_kernel_run_num, 1);
 }
+
+REGISTER_OP(op_multi_inputs_with_kernel, paddle::framework::OpWithKernelTest,
+            paddle::framework::OpKernelTestMultiInputsProtoAndCheckerMaker);
+REGISTER_OP_CPU_KERNEL(op_multi_inputs_with_kernel,
+                       paddle::framework::CPUKernalMultiInputsTest);
+
+// test with multi inputs
+TEST(OpKernel, multi_inputs) {
+  using namespace paddle::framework;
+
+  OpDesc op_desc;
+  op_desc.set_type("op_multi_inputs_with_kernel");
+  *op_desc.mutable_inputs()->Add() = "x0";
+  *op_desc.mutable_inputs()->Add() = "x1";
+  *op_desc.mutable_inputs()->Add() = "x2";
+  *op_desc.mutable_inputs()->Add() = "k0";
+  *op_desc.mutable_outputs()->Add() = "y0";
+  *op_desc.mutable_outputs()->Add() = "y1";
+  auto attr = op_desc.mutable_attrs()->Add();
+  attr->set_name("scale");
+  attr->set_type(paddle::framework::AttrType::FLOAT);
+  attr->set_f(3.14);
+
+  auto attr0 = op_desc.mutable_attrs()->Add();
+  attr0->set_name("input_format");
+  attr0->set_type(paddle::framework::AttrType::INTS);
+  auto input_format = attr0->mutable_ints();
+  input_format->Add(0);  // x0
+  input_format->Add(3);  // k
+  input_format->Add(4);  // end
+
+  auto attr1 = op_desc.mutable_attrs()->Add();
+  attr1->set_name("output_format");
+  attr1->set_type(paddle::framework::AttrType::INTS);
+  auto output_format = attr1->mutable_ints();
+  output_format->Add(0);  // y0
+  output_format->Add(2);  // y1
+
+  paddle::platform::CPUDeviceContext cpu_device_context;
+  auto scope = std::make_shared<Scope>();
+
+  OperatorPtr op(paddle::framework::OpRegistry::CreateOp(op_desc));
+  op->Run(scope, cpu_device_context);
+}
diff --git a/paddle/operators/add_op.h b/paddle/operators/add_op.h
index 17d459dbc86af73fa86934a5ccce9da509c59c6b..000564f66dff2b20d17cee10e44aaca114c2c908 100644
--- a/paddle/operators/add_op.h
+++ b/paddle/operators/add_op.h
@@ -8,10 +8,10 @@ namespace operators {
 template <typename Place>
 class AddKernel : public framework::OpKernel {
 public:
-  void Compute(const KernelContext &context) const override {
+  void Compute(const framework::KernelContext &context) const override {
     LOG(INFO) << "Add kernel in " << typeid(Place).name();
   }
 };
 
-}  // namespace op
+}  // namespace operators
 }  // namespace paddle