diff --git a/x2paddle/convert.py b/x2paddle/convert.py
index a028662d70d6814266a52ccc6826e640c7671b7e..f897dc9bda711a3936c055f5a3822320f7f21674 100644
--- a/x2paddle/convert.py
+++ b/x2paddle/convert.py
@@ -11,3 +11,8 @@
 # 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.
+from x2paddle.parser.tf_parser import TFParser
+
+parser = TFParser('/ssd2/Jason/github/X2Paddle/x2paddle/tests/frozen_darknet_yolov3_model.pb', 
+                in_nodes=['inputs'], out_nodes=['output_boxes'],
+                in_shapes=[[-1, 416, 416, 3]])
diff --git a/x2paddle/core/graph.py b/x2paddle/core/graph.py
index 9ca89e64379676b19fe0cdcf98da3f4f3f781fad..1ec62280d6fac87deca91a2eacaaa8bd7a866cac 100644
--- a/x2paddle/core/graph.py
+++ b/x2paddle/core/graph.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from utils import *
 import collections
 
 
@@ -44,7 +43,7 @@ class Graph(object):
         self.topo_sort = list()
         self.model = model
 
-    def build(self, input_format):
+    def build(self):
         self._make_input_nodes()
         self._make_output_nodes()
         self._get_topo_sort()
@@ -65,7 +64,7 @@ class Graph(object):
             num_inputs[name] = len(node.inputs)
 
         self.topo_sort = self.input_nodes[:]
-        while idx in range(len(self.topo_sort)):
+        for idx in range(len(self.topo_sort)):
             current_node = self.node_map[self.topo_sort[idx]]
             for node in current_node.outputs:
                 num_inputs[node.layer_name] -= 1
@@ -79,8 +78,6 @@ class Graph(object):
             return self.node_map[name]
 
     def connect(self, src, dst):
-        if src.layer_name == dst.layer_name or src.layer_name not in \
-            self.node_map or dst.layer_name not in self.node_map:
-            raise Exception('Warning: Node not exist or there is a self-loop')
-        self.node_map[dst.layer_name].inputs.append(src)
-        self.node_map[src.layer_name].outputs.append(dst)
+        if dst not in self.node_map:
+            raise Exception("node[{}] not in graph".format(dst))
+        self.node_map[dst].inputs.append(src)
diff --git a/x2paddle/parser/tf_parser.py b/x2paddle/parser/tf_parser.py
index af880481c292f8a5099e12630d1af5a737e682ef..21d62a6aef665c4867e9e069b3540485bfe02614 100644
--- a/x2paddle/parser/tf_parser.py
+++ b/x2paddle/parser/tf_parser.py
@@ -13,18 +13,40 @@
 # limitations under the License.
 
 from x2paddle.core.graph import GraphNode, Graph
-
+from tensorflow.python.platform import gfile
+import tensorflow as tf
+import copy
 
 class TFGraphNode(GraphNode):
     def __init__(self, layer, layer_name=None):
         super(TFGraphNode, self).__init__(layer, layer_name)
-        self.layer_type = layer.op.lower()
+        self.layer_type = layer.op
 
 
 class TFGraph(Graph):
     def __init__(self, model):
         super(TFGraph, self).__init__(model)
+        self.multi_output_ops = [
+                            'Split',
+                            'Unpack']
+
+    def build(self):
+        for layer in self.model.node:
+            self.node_map[layer.name] = TFGraphNode(layer)
 
+        for layer_name, node in self.node_map.items():
+            for in_node in node.layer.input:
+                if in_node not in self.node_map:
+                    if in_node.strip().split(':')[0] in self.node_map:
+                        self.connect(in_node, layer_name)
+                    else:
+                        raise Exception('input[{}] of node[{}] does not exist in node_map'.format(in_node, layer_name))
+                else:
+                    if self.node_map[in_node].layer_type in self.multi_output_ops:
+                        in_node += ":0"
+                    self.connect(in_node, layer_name)
+
+        super(TFGraph, self).build()
 
 class TFParser(object):
     def __init__(self, pb_model, in_nodes=None, out_nodes=None, in_shapes=None):
@@ -33,11 +55,14 @@ class TFParser(object):
         assert in_shapes is not None, "in_shapes should not be None"
         assert len(in_shapes) == len(in_nodes), "length of in_shapes and in_nodes should be equal"
 
-        serialized_str = open(pb_model, 'rb').read()
-        tf.reset_default_graph()
-        graph_def = tf.GraphDef()
-        graph_def.ParseFromString(serialized_str)
-
-        sess = tf.Session(graph=tf.get_default_graph())
-        sess.run(tf.global_variables_initializer())
+        sess = tf.Session()
+        with gfile.FastGFile(pb_model, 'rb') as f:
+            graph_def = tf.GraphDef()
+            graph_def.ParseFromString(f.read())
+            sess.graph.as_default()
+            tf.import_graph_def(graph_def, name='')
         
+        sess.run(tf.global_variables_initializer())
+
+        self.tf_graph = TFGraph(sess.graph._as_graph_def(add_shapes=True)[0])
+        self.tf_graph.build()