diff --git a/app/gl_tracking.c b/app/gl_tracking.c
index 33a517e..3d553da 100644
--- a/app/gl_tracking.c
+++ b/app/gl_tracking.c
@@ -111,7 +111,7 @@ void MidLineTrack() {
     //考虑近点
     near_angle = -atanf(PIXPERMETER * 2 * 0.2 * dx_near / dn_near / dn_near) / PI * 180 ;
     //考虑远点
-```    pure_angle = -atanf(PIXPERMETER * 2 * 0.2 * dx/ dn / dn) / PI * 180 ;  
+    pure_angle = -atanf(PIXPERMETER * 2 * 0.2 * dx/ dn / dn) / PI * 180 ;