diff --git a/src/main/java/com/xydl/cac/entity/IcdFileConfig.java b/src/main/java/com/xydl/cac/entity/IcdFileConfig.java
index d1fd7ef..312a66e 100644
--- a/src/main/java/com/xydl/cac/entity/IcdFileConfig.java
+++ b/src/main/java/com/xydl/cac/entity/IcdFileConfig.java
@@ -58,4 +58,9 @@ public class IcdFileConfig {
                 .build();
         instList.add(item);
     }
+
+    public String buildParamIndex(IcdFileConfigInst inst) {
+        String param = iedName + ldeviceInst + "/" + lnClass + inst.getInst() + "$" + inst.getParamindex();
+        return param;
+    }
 }
\ No newline at end of file
diff --git a/src/main/java/com/xydl/cac/util/IcdXmlUtil.java b/src/main/java/com/xydl/cac/util/IcdXmlUtil.java
index 3229bf9..66746d2 100644
--- a/src/main/java/com/xydl/cac/util/IcdXmlUtil.java
+++ b/src/main/java/com/xydl/cac/util/IcdXmlUtil.java
@@ -53,7 +53,7 @@ public class IcdXmlUtil {
             String dai = findLN_DOI_DAI(lnNode, doName);
 
             String key = iedName + ldInst + "/" + lnClass + "/" + doName;
-            String param = iedName + ldInst + "/" + lnClass + lnInst + "$" + fc + "$" + doName + "$" + dai;
+            String param = fc + "$" + doName + "$" + dai;
             if ("MX".equals(fc)) {
                 IcdFileConfig config = result.get(key);
                 if (config == null) {