diff --git a/paddle_quantum/circuit.py b/paddle_quantum/circuit.py
index 5fb1c99a04566e9c5b812aeeb5a1061977dc547f..2eba39f84a900b6294c97dc01585ec2e47ebadae 100644
--- a/paddle_quantum/circuit.py
+++ b/paddle_quantum/circuit.py
@@ -59,7 +59,7 @@ class UAnsatz:
                         paddle.to_tensor(np.array([math.pi / 4])), paddle.to_tensor(np.array([-math.pi / 4]))]
         # Record history of adding gates to the circuit
         self.__history = []
-       
+
     def __add__(self, cir):
         r"""重载加法 ‘+’ 运算符，用于拼接两个维度相同的电路