diff --git a/seatunnel-server/seatunnel-app/src/main/java/org/apache/seatunnel/app/thirdparty/framework/SeaTunnelOptionRuleWrapper.java b/seatunnel-server/seatunnel-app/src/main/java/org/apache/seatunnel/app/thirdparty/framework/SeaTunnelOptionRuleWrapper.java
index 41f307e9a..1e4624dfb 100644
--- a/seatunnel-server/seatunnel-app/src/main/java/org/apache/seatunnel/app/thirdparty/framework/SeaTunnelOptionRuleWrapper.java
+++ b/seatunnel-server/seatunnel-app/src/main/java/org/apache/seatunnel/app/thirdparty/framework/SeaTunnelOptionRuleWrapper.java
@@ -98,7 +98,7 @@ public static FormStructure wrapper(
         return FormOptionSort.sortFormStructure(formStructureBuilder.build());
     }
 
-    private static Object getDefaultValue(Option<?> option) {
+    private static String getDefaultValue(Option<?> option) {
         Object defValue = option.defaultValue();
         if (defValue == null) {
             return null;
@@ -106,7 +106,7 @@ private static Object getDefaultValue(Option<?> option) {
         if (String.class.equals(option.typeReference().getType())) {
             return PlaceholderUtil.escapePlaceholders(defValue.toString());
         }
-        return defValue;
+        return defValue.toString();
     }
 
     private static List<AbstractFormOption> wrapperOptionOptions(