diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/rtkrcv/RtkrcvManager.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/rtkrcv/RtkrcvManager.java
index 2ef271c0..0007429b 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/rtkrcv/RtkrcvManager.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/rtkrcv/RtkrcvManager.java
@@ -168,11 +168,11 @@ public class RtkrcvManager {
     private String replaceLine(String content, String key, String value){
         String[] lines = content.split("\n");
         StringBuilder sb = new StringBuilder();
-        String prefix = key + "       =";
         for(String line : lines){
-            if(line.trim().startsWith(key+"        =") || line.trim().startsWith(key+"       =") || line.trim().startsWith(key+" =")){
+            String t = line.trim();
+            if(t.startsWith(key)){
                 sb.append(key).append("       =").append(value).append("\n");
-            }else{
+            } else {
                 sb.append(line).append("\n");
             }
         }