diff --git a/python/paddle/v2/framework/graph.py b/python/paddle/v2/framework/graph.py
index b9356aaf899829fb000956eb86dfc4b082af0b70..8d808556851c42a6ecd096d247e9874f997808c1 100644
--- a/python/paddle/v2/framework/graph.py
+++ b/python/paddle/v2/framework/graph.py
@@ -46,18 +46,18 @@ class Variable(object):
 
         if name is None:
             name = Variable._unique_var_name_()
-        self.proto = self.block.proto.new_var(name)
+        self.desc = self.block.desc.new_var(name)
 
         if shape is not None:
-            self.proto.set_shape(shape)
+            self.desc.set_shape(shape)
 
         if dtype is not None:
             # TODO(yuyang18): Convert dtype from numpy.dtype
-            self.proto.set_data_type(dtype)
+            self.desc.set_data_type(dtype)
 
         if lod_level is not None:
             # TODO(yuyang18): set_lod_level is not defined.
-            self.proto.set_lod_level(lod_level)
+            self.desc.set_lod_level(lod_level)
 
         self.block.vars[name] = self
         self.op = None
@@ -121,31 +121,31 @@ class Operator(object):
 
 class Block(object):
     def __init__(self, program, idx):
-        self.proto = program.proto.block(idx)
+        self.desc = program.desc.block(idx)
         self.vars = dict()  # var_name --> var
         self.ops = collections.deque()  # operator list
         self.program = program
 
     @property
     def parent_idx(self):
-        return self.proto.parent
+        return self.desc.parent
 
     @property
     def idx(self):
-        return self.proto.id
+        return self.desc.id
 
     def create_var(self, *args, **kwargs):
         return Variable(self, *args, **kwargs)
 
     def append_op(self, *args, **kwargs):
-        op_desc = self.proto.append_op()
+        op_desc = self.desc.append_op()
         op = Operator(self, op_desc, *args, **kwargs)
         self.ops.append(op)
         return op
 
     def prepend_op(self, *args, **kwargs):
-        op_proto = self.proto.prepend_op()
-        op = Operator(self, op_proto, *args, **kwargs)
+        op_desc = self.desc.prepend_op()
+        op = Operator(self, op_desc, *args, **kwargs)
         self.ops.appendleft(op)
         return op
 
@@ -162,7 +162,7 @@ class Program(object):
     def __init__(self):
         assert not hasattr(self.__class__,
                            '_instance'), 'Do not call constructor directly!'
-        self.proto = core.ProgramDesc.instance()
+        self.desc = core.ProgramDesc.instance()
         self.blocks = [Block(self, 0)]
         self.current_block_idx = 0
 
@@ -174,7 +174,7 @@ class Program(object):
 
     def create_block(self):
         new_block_idx = len(self.blocks)
-        self.proto.append_block(self.current_block().proto)
+        self.desc.append_block(self.current_block().desc)
         self.current_block_idx = new_block_idx
         self.blocks.append(Block(self, self.current_block_idx))
         return self.current_block()