diff --git a/x2paddle/core/util.py b/x2paddle/core/util.py
index 34960951dbd6d6ba08a707017e54c1e168a8c9f0..faafe83288b00938bf0b1b39d8f079111a4e6545 100644
--- a/x2paddle/core/util.py
+++ b/x2paddle/core/util.py
@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import paddle.fluid as fluid
 import numpy
 import math
 import os