diff --git a/paddle/pybind/pybind.cc b/paddle/pybind/pybind.cc
index 62539c10760d1deabed46e2c388b3f9efc7cfb2f..43c52957a1e3d21866a0d68e40cb0f764c53b937 100644
--- a/paddle/pybind/pybind.cc
+++ b/paddle/pybind/pybind.cc
@@ -56,17 +56,6 @@ void ExposeOperator(ClassType& m) {
       .def("__str__", &ClassType::type::DebugString);
 }
 
-template <typename ClassType>
-void ExposeOperator(ClassType& m) {
-  m.def("infer_shape", &ClassType::type::InferShape)
-      .def("run", &ClassType::type::Run)
-      .def("outputs",
-           [](const typename ClassType::type& op) -> std::vector<std::string> {
-             return op.outputs_;
-           })
-      .def("__str__", &ClassType::type::DebugString);
-}
-
 PYBIND11_PLUGIN(core) {
   py::module m("core", "C++ core of PaddlePaddle");
 
diff --git a/python/paddle/v2/framework/network.py b/python/paddle/v2/framework/network.py
index bde48851a0959c720424ae9e4f53515046820232..ade7e4b85e67c1a8509b9b7c3bb421aac0fe36de 100644
--- a/python/paddle/v2/framework/network.py
+++ b/python/paddle/v2/framework/network.py
@@ -2,13 +2,28 @@ import paddle.v2.framework.core as core
 from paddle.v2.framework.create_op_creation_methods import op_creations
 from default_scope_funcs import create_var, get_var, get_cur_scope
 
+__all__ = ['Network']  # Only expose Network
+
 
 class NetworkFunctor(object):
+    """
+    Network Op Creation Function. Used internally in this module.
+    It convert string input to Variable. If it is not created before, just 
+    create in scope.
+    
+    It is a functor object. means the instances are callable.
+    
+    :param func: The op creation function which generated in Python.
+    :param net: The Network instance.
+    """
+
     def __init__(self, func, net):
         self.func = func
         self.net = net
 
-    def __call__(self, **kwargs):
+    def __call__(self, *args, **kwargs):
+        if len(args) != 0:
+            raise ValueError("Paddle must use keyword argument")
         inputs = self.func.all_input_args
         for ipt in inputs:
             if ipt in kwargs:
@@ -58,6 +73,22 @@ class NetworkFunctor(object):
 
 
 class Network(object):
+    """
+    The network concept. It avoid user to manually create operator, create 
+    variable, and combine them into a Net. Just use Network.xxx can create the
+    operator, create variables in default scope, and add them into `self.net`.
+    
+    For example:
+    
+    ..  code-block: python
+    
+        net = Network()
+        out = net.add_two(X="a", Y="b")
+        fc_out = net.fc(X="out", W="fc.w")
+        
+        net.run(...)
+    """
+
     def __init__(self):
         self.net = core.Net.create()
         funcs = (func_name for func_name in dir(op_creations)
@@ -65,6 +96,9 @@ class Network(object):
         self.generate_idx = 0
         self.var_name_map = dict()
 
+        # TODO(yuyang18): This code can work, but do not generate a good
+        # docstring, try to give a better way generate function in runtime
+        # later.
         for func_name in funcs:
             func = getattr(op_creations, func_name)
             impl = NetworkFunctor(func, self)
@@ -92,5 +126,5 @@ if __name__ == '__main__':
     net = Network()
     out = net.add_two(X="a", Y="b")
     fc_out = net.fc(X=out, W="fc.w", b="fc.b", activation="softmax")
-
-    print str(net)
+    net.complete_add_op()
+    print net
diff --git a/python/paddle/v2/framework/tests/CMakeLists.txt b/python/paddle/v2/framework/tests/CMakeLists.txt
index b3eb2ef8a8966318fe33ca8b3032a4120c73909f..7d1229a34c50548db69c5a720f0bf333bd0dd58d 100644
--- a/python/paddle/v2/framework/tests/CMakeLists.txt
+++ b/python/paddle/v2/framework/tests/CMakeLists.txt
@@ -12,4 +12,5 @@ add_python_test(test_framework
     test_mul_op.py
     test_sigmoid_op.py
     test_softmax_op.py
-    test_rowwise_add_op.py)
+    test_rowwise_add_op.py
+    test_network.py)
diff --git a/python/paddle/v2/framework/tests/test_network.py b/python/paddle/v2/framework/tests/test_network.py
new file mode 100644
index 0000000000000000000000000000000000000000..310290e34b0d5056de6eb719a84352078057e419
--- /dev/null
+++ b/python/paddle/v2/framework/tests/test_network.py
@@ -0,0 +1,23 @@
+from paddle.v2.framework.network import Network
+import paddle.v2.framework.core as core
+import unittest
+
+
+class TestNet(unittest.TestCase):
+    def test_net_all(self):
+        net = Network()
+        out = net.add_two(X="X", Y="Y")
+        fc_out = net.fc(X=out, W="w")
+        net.complete_add_op()
+        self.assertTrue(isinstance(fc_out, core.Variable))
+        self.assertEqual(
+            '''Op(naive_net), inputs:(@EMPTY@, X, Y, w), outputs:(@TEMP@fc@0, add_two@OUT@0, fc@OUT@1).
+    Op(add_two), inputs:(X, Y), outputs:(add_two@OUT@0).
+    Op(fc), inputs:(add_two@OUT@0, w, @EMPTY@), outputs:(fc@OUT@1, @TEMP@fc@0).
+        Op(mul), inputs:(add_two@OUT@0, w), outputs:(@TEMP@fc@0).
+        Op(sigmoid), inputs:(@TEMP@fc@0), outputs:(fc@OUT@1).
+''', str(net))
+
+
+if __name__ == '__main__':
+    unittest.main()