diff --git a/paddle/api/Arguments.cpp b/paddle/api/Arguments.cpp
index 0cafbd896e2d88aee4406bd0305878ce489bc18d..41beed38a87601cb57072c8966cd0fd2ea156524 100644
--- a/paddle/api/Arguments.cpp
+++ b/paddle/api/Arguments.cpp
@@ -137,6 +137,10 @@ void Arguments::setSlotSequenceDim(size_t idx, IVector* vec) throw(RangeError) {
   a.cpuSequenceDims = m->cast<paddle::IVector>(vec->getSharedPtr());
 }
 
+float Arguments::sumCosts() const {
+  return paddle::Argument::sumCosts(m->outputs);
+}
+
 int64_t Arguments::getBatchSize(size_t idx) const throw(RangeError) {
   auto& a = m->getArg(idx);
   return a.getBatchSize();
diff --git a/paddle/api/PaddleAPI.h b/paddle/api/PaddleAPI.h
index 364d19f9414430709108824dce75a1007332d824..f5af8b0035b44d97832dd90ca2eeba079503715c 100644
--- a/paddle/api/PaddleAPI.h
+++ b/paddle/api/PaddleAPI.h
@@ -450,6 +450,8 @@ public:
                                         IVector* vec) throw(RangeError);
   void setSlotSequenceDim(size_t idx, IVector* vec) throw(RangeError);
 
+  float sumCosts() const;
+
 private:
   static Arguments* createByPaddleArgumentVector(void* ptr);
   void* getInternalArgumentsPtr() const;
@@ -546,6 +548,10 @@ public:
   ParameterConfig* getConfig();
   void setValueUpdated();
 
+  bool save(const std::string& filename) const;
+
+  bool load(const std::string& filename) const;
+
   size_t getSize() const;
 
 private:
diff --git a/paddle/api/Parameter.cpp b/paddle/api/Parameter.cpp
index ddc00d8d1af4c58d7e2233423bea916408bee92b..19f7a898d6b8d3d02c5654559dcb86728266731e 100644
--- a/paddle/api/Parameter.cpp
+++ b/paddle/api/Parameter.cpp
@@ -57,4 +57,12 @@ size_t Parameter::getID() const { return m->getPtr()->getID(); }
 
 void Parameter::setValueUpdated() { m->getPtr()->setValueUpdated(); }
 
+bool Parameter::save(const std::string& filename) const {
+  return m->getPtr()->save(filename);
+}
+
+bool Parameter::load(const std::string& filename) const {
+  return m->getPtr()->load(filename);
+}
+
 size_t Parameter::getSize() const { return m->getPtr()->getSize(); }
diff --git a/paddle/api/test/.gitignore b/paddle/api/test/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..b7948824a1eab119140dd9bea20276c303fe4af1
--- /dev/null
+++ b/paddle/api/test/.gitignore
@@ -0,0 +1,2 @@
+*.w0
+*.wbias
diff --git a/paddle/api/test/testArguments.py b/paddle/api/test/testArguments.py
index 8cabecd242fb4eb98c0fe468687ef179245e4535..a04a805d7a64ef906c8388f1241b9ef823e4d9e0 100644
--- a/paddle/api/test/testArguments.py
+++ b/paddle/api/test/testArguments.py
@@ -22,6 +22,8 @@ class TestArguments(unittest.TestCase):
         args = swig_paddle.Arguments.createArguments(1)
         args.setSlotValue(0, m)
 
+        self.assertAlmostEqual(27.0, args.sumCosts())
+
         mat = args.getSlotValue(0)
         assert isinstance(mat, swig_paddle.Matrix)
         np_mat = mat.toNumpyMatInplace()
diff --git a/paddle/api/test/testGradientMachine.py b/paddle/api/test/testGradientMachine.py
index b81eafa9673ca34f1b7e06401098d55bdb1b35a5..4b705f66eccd267f326fe0662a17b33a09fda982 100644
--- a/paddle/api/test/testGradientMachine.py
+++ b/paddle/api/test/testGradientMachine.py
@@ -45,6 +45,7 @@ class TestGradientMachine(unittest.TestCase):
             assert isinstance(val, swig_paddle.Vector)
             arr = numpy.full((len(val), ), 0.1, dtype="float32")
             val.copyFromNumpyArray(arr)
+            self.assertTrue(param.save(param.getName()))
             param_config = param.getConfig().toProto()
             assert isinstance(param_config,
                               paddle.proto.ParameterConfig_pb2.ParameterConfig)
@@ -92,6 +93,9 @@ class TestGradientMachine(unittest.TestCase):
 
         self.assertTrue(self.isCalled)
 
+        for param in machine.getParameters():
+            self.assertTrue(param.load(param.getName()))
+
     def test_train_one_pass(self):
         conf_file_path = './testTrainConfig.py'
         trainer_config = swig_paddle.TrainerConfig.createFromTrainerConfigFile(