diff --git a/device_cars/src/main/java/com/xr/device_car/modules/analysis/controller/FocalLengthConfigController.java b/device_cars/src/main/java/com/xr/device_car/modules/analysis/controller/FocalLengthConfigController.java
index dbe93e6..90b50c4 100644
--- a/device_cars/src/main/java/com/xr/device_car/modules/analysis/controller/FocalLengthConfigController.java
+++ b/device_cars/src/main/java/com/xr/device_car/modules/analysis/controller/FocalLengthConfigController.java
@@ -183,7 +183,7 @@ public class FocalLengthConfigController {
                 stringBuffer.append("\t\t\t\t").append("\"expected_len\":"+focalLengthConfig.getExpectedLen()+",\n");
                 stringBuffer.append("\t\t\t\t\"padding\":\"0\",\n");
                 stringBuffer.append("\t\t\t\t\"append_from\":\"head\",\n");
-                stringBuffer.append("\t\t\t\t\"shorten_from\":\"tail\",\n");
+                stringBuffer.append("\t\t\t\t\"shorten_from\":\"tail\"\n");
                 stringBuffer.append("\t\t\t},\n");
                 stringBuffer.append("\t\t\t\"scales\": [0.0,0.0,1.0,5.0]\n\t\t},");
             } else if(config1.getConfigType().equals("5")){