diff --git a/mini_pupper_recognition/mini_pupper_recognition/line_detection_node.py b/mini_pupper_recognition/mini_pupper_recognition/line_detection_node.py
index 8de1a3b..98fa50d 100644
--- a/mini_pupper_recognition/mini_pupper_recognition/line_detection_node.py
+++ b/mini_pupper_recognition/mini_pupper_recognition/line_detection_node.py
@@ -90,8 +90,8 @@ def line_recognition(self, msg):
         linear, angular = detect_black_line(cv_img)
 
         message1 = LineDetectionResult()
-        message1.linear = linear
-        message1.angular = angular
+        message1.linear = str(linear)
+        message1.angular = str(angular)
         self.get_logger().info(f"Linear: {message1.linear}\nAngular: {message1.angular:.2f}")