diff --git a/web/app/components/workflow/nodes/loop/components/loop-variables/item.tsx b/web/app/components/workflow/nodes/loop/components/loop-variables/item.tsx
index 0e8650d743..db63286efb 100644
--- a/web/app/components/workflow/nodes/loop/components/loop-variables/item.tsx
+++ b/web/app/components/workflow/nodes/loop/components/loop-variables/item.tsx
@@ -12,6 +12,7 @@ import type {
 } from '@/app/components/workflow/nodes/loop/types'
 import { checkKeys, replaceSpaceWithUnderscreInVarNameInput } from '@/utils/var'
 import Toast from '@/app/components/base/toast'
+import { ValueType, VarType } from '@/app/components/workflow/types'
 
 type ItemProps = {
   item: LoopVariable
@@ -42,12 +43,25 @@ const Item = ({
     handleUpdateLoopVariable(item.id, { label: e.target.value })
   }, [item.id, handleUpdateLoopVariable])
 
+  const getDefaultValue = useCallback((varType: VarType, valueType: ValueType) => {
+    if(valueType === ValueType.variable)
+      return undefined
+    switch (varType) {
+      case VarType.boolean:
+        return 'false'
+      case VarType.arrayBoolean:
+        return ['false']
+      default:
+        return undefined
+    }
+  }, [])
+
   const handleUpdateItemVarType = useCallback((value: any) => {
-    handleUpdateLoopVariable(item.id, { var_type: value, value: undefined })
+    handleUpdateLoopVariable(item.id, { var_type: value, value: getDefaultValue(value, item.value_type) })
   }, [item.id, handleUpdateLoopVariable])
 
   const handleUpdateItemValueType = useCallback((value: any) => {
-    handleUpdateLoopVariable(item.id, { value_type: value, value: undefined })
+    handleUpdateLoopVariable(item.id, { value_type: value, value: getDefaultValue(item.var_type, value) })
   }, [item.id, handleUpdateLoopVariable])
 
   const handleUpdateItemValue = useCallback((value: any) => {