diff --git a/cmake/util.cmake b/cmake/util.cmake
index 8c9143462227e7081142f6be250b1a45e4b6d51b..87ad9d91d8701c56255c1e7f224764998df634a7 100644
--- a/cmake/util.cmake
+++ b/cmake/util.cmake
@@ -84,6 +84,7 @@ function(link_paddle_exe TARGET_NAME)
         paddle_parameter
         paddle_proto
         paddle_cuda
+        paddle_optimizer
         ${EXTERNAL_LIBS}
         ${CMAKE_THREAD_LIBS_INIT}
         ${CMAKE_DL_LIBS}
diff --git a/paddle/optimizer/CMakeLists.txt b/paddle/optimizer/CMakeLists.txt
index bafd8a9b97a97a0e90ec2f9b1a72c5f2c8beadf2..791be95efa9e8063a2f4b9632d86db2f5bc751e6 100644
--- a/paddle/optimizer/CMakeLists.txt
+++ b/paddle/optimizer/CMakeLists.txt
@@ -9,9 +9,8 @@ set(OPITMIZER_SRCS
     sgd_optimizer.cc
   )
 
-add_library(optimizer STATIC ${OPITMIZER_SRCS})
-add_dependencies(optimizer gen_proto_cpp)
+add_library(paddle_optimizer STATIC ${OPITMIZER_SRCS})
+add_dependencies(paddle_optimizer gen_proto_cpp)
 
 add_simple_unittest(serialization_test)
 add_simple_unittest(parameter_optimizer_test)
-add_dependencies(parameter_optimizer_test optimizer)
diff --git a/paddle/optimizer/Tensor.h b/paddle/optimizer/Tensor.h
index b8f212e81ff7935ef14ff3896c328feb789e7bf6..2eefdec3e5e3410a60bc1f57761930af4e6c8a45 100644
--- a/paddle/optimizer/Tensor.h
+++ b/paddle/optimizer/Tensor.h
@@ -15,13 +15,17 @@ template <class T>
 class TensorT {
 public:
   TensorT(size_t size) : height_(1), width_(size) { data_ = new T[size]; }
+
   TensorT(T* data, size_t size) : height_(1), width_(size), data_(data) {}
-  TensorT(T* data, size_t h, size_t w) : height_(h), width_(w), data_(data_) {}
+
+  TensorT(T* data, size_t h, size_t w) : height_(h), width_(w), data_(data) {}
+
   ~TensorT() {
     if (data_) delete data_;
   }
 
   T* get_buffer() { return this->data_; }
+
   T& operator[](const size_t idx) {
     CHECK(idx >= 0 && idx < this->width_) << "out of index range";
     return data_[idx];
diff --git a/paddle/optimizer/parameter_optimizer_test.cpp b/paddle/optimizer/parameter_optimizer_test.cpp
index 8d3bfa9cf4b75ffbc2474b7dc0c040c9fa06adbe..afacd6d54a79eeea3e55b994af1441768bc03581 100644
--- a/paddle/optimizer/parameter_optimizer_test.cpp
+++ b/paddle/optimizer/parameter_optimizer_test.cpp
@@ -49,8 +49,8 @@ public:
     config_.set_lr_policy(OptimizerConfig::ConstLr);
     config_.mutable_const_lr()->set_learning_rate(0.1);
 
-    ParameterOptimizer* opt =
-        ParameterOptimizer::Create(config_.SerializeAsString(), parameter);
+    std::string str = config_.SerializeAsString();
+    ParameterOptimizer* opt = ParameterOptimizer::Create(str, parameter);
     opts_.push_back(opt);
     opts_table_[opts_.size()] = OptimizerConfig::SGD;
   }
@@ -64,8 +64,8 @@ public:
     config_.mutable_adam()->set_decay(0.0);
     config_.set_lr_policy(OptimizerConfig::ConstLr);
     config_.mutable_const_lr()->set_learning_rate(0.1);
-    ParameterOptimizer* opt =
-        ParameterOptimizer::Create(config_.SerializeAsString(), parameter);
+    std::string str = config_.SerializeAsString();
+    ParameterOptimizer* opt = ParameterOptimizer::Create(str, parameter);
     opts_.push_back(opt);
     opts_table_[opts_.size()] = OptimizerConfig::Adam;
   }
diff --git a/paddle/optimizer/serialization.h b/paddle/optimizer/serialization.h
index 21de3259a885b663da738f0b45695f796f1a936d..92fbf65cc6b98d7f92841bafe4ab77001ca03b7c 100644
--- a/paddle/optimizer/serialization.h
+++ b/paddle/optimizer/serialization.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <iostream>
 #include <sstream>
 #include <string>
 #include <type_traits>
@@ -16,7 +17,7 @@ static void TensorToProto(const Tensor& tensor, TensorProto* proto) {
   for (size_t i = 0; i < tensor.size(); ++i) {
     os << tensor[i];
     proto->add_content(os.str());
-    os.clear();
+    os.str(std::string());
   }
 }
 
@@ -25,6 +26,7 @@ static void ProtoToTensor(const TensorProto& proto, Tensor* tensor) {
   for (auto i = 0; i < proto.content_size(); ++i) {
     sin << proto.content(i);
     sin >> (*tensor)[i];
+    sin.str(std::string());
     sin.clear();
   }
 }
diff --git a/paddle/optimizer/serialization_test.cpp b/paddle/optimizer/serialization_test.cpp
index 98fbdf5a5e2cb703440b4178eee6a324a9e9b3cf..d2454140dc243b40ed8348578360b30894213838 100644
--- a/paddle/optimizer/serialization_test.cpp
+++ b/paddle/optimizer/serialization_test.cpp
@@ -10,6 +10,7 @@ TEST(TensorToProto, Case1) {
     t[i] = i;
     t1[i] = 0;
   }
+
   TensorProto proto;
   TensorToProto(t, &proto);
   ProtoToTensor(proto, &t1);