diff --git a/py/measure_lib.py b/py/measure_lib.py
index 617fcac..b89e837 100644
--- a/py/measure_lib.py
+++ b/py/measure_lib.py
@@ -183,7 +183,7 @@ def vs_measurement(txt_name,position):
     y_bot = np.array(y_bot)
     x_top = np.array(x_top)
     y_top = np.array(y_top)
-    if not (x_bot or y_bot or x_top or y_top)
+    if not (x_bot or y_bot or x_top or y_top):
         return 1,1,1,1
 
     # 拟合路沿上下直线方程