diff --git a/tests/model/test_base.py b/tests/model/test_base.py
index dc2a333..70c3a9a 100644
--- a/tests/model/test_base.py
+++ b/tests/model/test_base.py
@@ -16,7 +16,9 @@
 
 class TestStochasticTensor(tf.test.TestCase):
     def test_init(self):
-        samples = Mock()
+        static_shape = Mock()
+        get_shape_func = Mock(return_value=static_shape)
+        samples = Mock(get_shape=get_shape_func)
         log_probs = Mock()
         probs = Mock()
         sample_func = Mock(return_value=samples)
@@ -35,6 +37,8 @@ def test_init(self):
         self.assertTrue(s_tensor.tensor is samples)
         self.assertTrue(s_tensor.log_prob(None) is log_probs)
         self.assertTrue(s_tensor.prob(None) is probs)
+        self.assertTrue(s_tensor.get_shape() is static_shape)
+        self.assertTrue(s_tensor.shape is static_shape)
 
         obs_int32 = tf.placeholder(tf.int32, None)
         obs_float32 = tf.placeholder(tf.float32, None)
diff --git a/zhusuan/model/base.py b/zhusuan/model/base.py
index be7a690..7732294 100644
--- a/zhusuan/model/base.py
+++ b/zhusuan/model/base.py
@@ -118,7 +118,16 @@ def tensor(self):
                 self._tensor = self.sample(self._n_samples)
         return self._tensor
 
+    @property
+    def shape(self):
+        return self.get_shape()
+
     def get_shape(self):
+        """
+        Static :attr:`shape`.
+
+        :return: A `TensorShape` instance.
+        """
         return self.tensor.get_shape()
 
     def sample(self, n_samples):