diff --git a/dal-client/src/main/java/com/ctrip/platform/dal/dao/configure/DefaultDataSourceConfigureLocator.java b/dal-client/src/main/java/com/ctrip/platform/dal/dao/configure/DefaultDataSourceConfigureLocator.java
index 29ac8b978..64e6e719f 100644
--- a/dal-client/src/main/java/com/ctrip/platform/dal/dao/configure/DefaultDataSourceConfigureLocator.java
+++ b/dal-client/src/main/java/com/ctrip/platform/dal/dao/configure/DefaultDataSourceConfigureLocator.java
@@ -91,7 +91,7 @@ private DalConnectionString getConnectionString(DataSourceIdentity id) {
         else if (id instanceof ApiDataSourceIdentity) {
             DalConnectionString dalConnectionString = apiConnectionStrings.get(id);
 
-            if (dalConnectionString == null) {
+            if (dalConnectionString == null || dalConnectionString instanceof InvalidConnectionString) {
                 dalConnectionString = ((ApiDataSourceIdentity) id).getConnectionString();
                 apiConnectionStrings.put(id, dalConnectionString);
             }