diff --git a/python/paddle/v2/fluid/layers/control_flow.py b/python/paddle/v2/fluid/layers/control_flow.py
index b9ab28a86a226c3027b2a449fd645d500d39f14b..72056cc7cdfb861f4bcdf2afdd3ba62c1a996f22 100644
--- a/python/paddle/v2/fluid/layers/control_flow.py
+++ b/python/paddle/v2/fluid/layers/control_flow.py
@@ -652,7 +652,8 @@ class While(object):
         parent_block.append_op(
             type='while',
             inputs={
-                'X': [parent_block.var(x_name) for x_name in x_name_list],
+                'X':
+                [parent_block.var_recursive(x_name) for x_name in x_name_list],
                 'Condition': [self.cond_var]
             },
             outputs={'Out': out_vars,
diff --git a/python/paddle/v2/fluid/tests/book/test_understand_sentiment.py b/python/paddle/v2/fluid/tests/book/test_understand_sentiment.py
index af917de8e337179feac835f4ba30afe584b5d42b..61f46b51c4457a7e7d3364d38f874e998318afef 100644
--- a/python/paddle/v2/fluid/tests/book/test_understand_sentiment.py
+++ b/python/paddle/v2/fluid/tests/book/test_understand_sentiment.py
@@ -47,6 +47,46 @@ def convolution_net(data, label, input_dim, class_dim=2, emb_dim=32,
     return avg_cost, accuracy, prediction
 
 
+def dyn_rnn_lstm(data, label, input_dim, class_dim=2, emb_dim=32,
+                 lstm_size=128):
+    emb = fluid.layers.embedding(
+        input=data, size=[input_dim, emb_dim], is_sparse=True)
+    sentence = fluid.layers.fc(input=emb, size=lstm_size, act='tanh')
+
+    rnn = fluid.layers.DynamicRNN()
+    with rnn.block():
+        word = rnn.step_input(sentence)
+        prev_hidden = rnn.memory(value=0.0, shape=[lstm_size])
+        prev_cell = rnn.memory(value=0.0, shape=[lstm_size])
+
+        def gate_common(ipt, hidden, size):
+            gate0 = fluid.layers.fc(input=ipt, size=size, bias_attr=True)
+            gate1 = fluid.layers.fc(input=hidden, size=size, bias_attr=False)
+            return gate0 + gate1
+
+        forget_gate = fluid.layers.sigmoid(x=gate_common(word, prev_hidden,
+                                                         lstm_size))
+        input_gate = fluid.layers.sigmoid(x=gate_common(word, prev_hidden,
+                                                        lstm_size))
+        output_gate = fluid.layers.sigmoid(x=gate_common(word, prev_hidden,
+                                                         lstm_size))
+        cell_gate = fluid.layers.sigmoid(x=gate_common(word, prev_hidden,
+                                                       lstm_size))
+
+        cell = forget_gate * prev_cell + input_gate * cell_gate
+        hidden = output_gate * fluid.layers.tanh(x=cell)
+        rnn.update_memory(prev_cell, cell)
+        rnn.update_memory(prev_hidden, hidden)
+        rnn.output(hidden)
+
+    last = fluid.layers.sequence_last_step(rnn())
+    prediction = fluid.layers.fc(input=last, size=class_dim, act="softmax")
+    cost = fluid.layers.cross_entropy(input=prediction, label=label)
+    avg_cost = fluid.layers.mean(x=cost)
+    accuracy = fluid.layers.accuracy(input=prediction, label=label)
+    return avg_cost, accuracy, prediction
+
+
 def stacked_lstm_net(data,
                      label,
                      input_dim,
@@ -270,6 +310,23 @@ class TestUnderstandSentiment(unittest.TestCase):
                 use_cuda=True,
                 parallel=True)
 
+    @unittest.skip(reason='make CI faster')
+    def test_dynrnn_lstm_gpu(self):
+        with self.new_program_scope():
+            main(
+                self.word_dict,
+                net_method=dyn_rnn_lstm,
+                use_cuda=True,
+                parallel=False)
+
+    def test_dynrnn_lstm_gpu_parallel(self):
+        with self.new_program_scope():
+            main(
+                self.word_dict,
+                net_method=dyn_rnn_lstm,
+                use_cuda=True,
+                parallel=True)
+
 
 if __name__ == '__main__':
     unittest.main()