diff --git a/packages/global/core/app/type.d.ts b/packages/global/core/app/type.d.ts
index 51093c9f6..38e7cb7c3 100644
--- a/packages/global/core/app/type.d.ts
+++ b/packages/global/core/app/type.d.ts
@@ -1,7 +1,11 @@
 import type { FlowNodeTemplateType, StoreNodeItemType } from '../workflow/type/node';
 import { AppTypeEnum } from './constants';
 import { PermissionTypeEnum } from '../../support/permission/constant';
-import { NodeInputKeyEnum, VariableInputEnum } from '../workflow/constants';
+import {
+  NodeInputKeyEnum,
+  VariableInputEnum,
+  WorkflowIOValueTypeEnum
+} from '../workflow/constants';
 import { SelectedDatasetType } from '../workflow/api';
 import { DatasetSearchModeEnum } from '../dataset/constants';
 import { TeamTagSchema as TeamTagsSchemaType } from '@fastgpt/global/support/user/team/type.d';
@@ -111,6 +115,7 @@ export type VariableItemType = {
   required: boolean;
   maxLen: number;
   enums: { value: string }[];
+  valueType: WorkflowIOValueTypeEnum;
 };
 // tts
 export type AppTTSConfigType = {
diff --git a/packages/web/i18n/en/common.json b/packages/web/i18n/en/common.json
index 029e3db04..d4767d5bf 100644
--- a/packages/web/i18n/en/common.json
+++ b/packages/web/i18n/en/common.json
@@ -914,6 +914,7 @@
         "add option": "Add option",
         "input type": "Text",
         "key": "Variable key",
+        "key already exists": "Key already exist",
         "key is required": "Variable key is required",
         "select type": "Dropdown single select",
         "text max length": "Maximum length",
diff --git a/packages/web/i18n/zh/common.json b/packages/web/i18n/zh/common.json
index 65028ed89..2a744ce2d 100644
--- a/packages/web/i18n/zh/common.json
+++ b/packages/web/i18n/zh/common.json
@@ -914,6 +914,7 @@
         "add option": "添加选项",
         "input type": "文本",
         "key": "变量 key",
+        "key already exists": "Key 已经存在",
         "key is required": "变量 key 是必须的",
         "select type": "下拉单选",
         "text max length": "最大长度",
diff --git a/projects/app/src/components/core/app/VariableEdit.tsx b/projects/app/src/components/core/app/VariableEdit.tsx
index 0f0b32cb6..2f1171f96 100644
--- a/projects/app/src/components/core/app/VariableEdit.tsx
+++ b/projects/app/src/components/core/app/VariableEdit.tsx
@@ -23,7 +23,11 @@ import {
   useDisclosure
 } from '@chakra-ui/react';
 import { SmallAddIcon } from '@chakra-ui/icons';
-import { VariableInputEnum, variableMap } from '@fastgpt/global/core/workflow/constants';
+import {
+  VariableInputEnum,
+  variableMap,
+  WorkflowIOValueTypeEnum
+} from '@fastgpt/global/core/workflow/constants';
 import type { VariableItemType } from '@fastgpt/global/core/app/type.d';
 import MyIcon from '@fastgpt/web/components/common/Icon';
 import { useForm } from 'react-hook-form';
@@ -310,6 +314,27 @@ const VariableEdit = ({
                   return;
                 }
               }
+
+              // check repeat key
+              const existingVariable = variables.find(
+                (item) => item.key === variable.key && item.id !== variable.id
+              );
+              if (existingVariable) {
+                toast({
+                  status: 'warning',
+                  title: t('common:core.module.variable.key already exists')
+                });
+                return;
+              }
+
+              // set valuetype based on variable.type
+              variable.valueType = valueTypeMap[variable.type];
+
+              // set default required value based on variableType
+              if (variable.type === VariableInputEnum.custom) {
+                variable.required = false;
+              }
+
               const onChangeVariable = [...variables];
               // update
               if (variable.id) {
@@ -344,9 +369,16 @@ export const defaultVariable: VariableItemType = {
   type: VariableInputEnum.input,
   required: true,
   maxLen: 50,
-  enums: [{ value: '' }]
+  enums: [{ value: '' }],
+  valueType: WorkflowIOValueTypeEnum.string
 };
 export const addVariable = () => {
   const newVariable = { ...defaultVariable, key: '', id: '' };
   return newVariable;
 };
+const valueTypeMap = {
+  [VariableInputEnum.input]: WorkflowIOValueTypeEnum.string,
+  [VariableInputEnum.select]: WorkflowIOValueTypeEnum.string,
+  [VariableInputEnum.textarea]: WorkflowIOValueTypeEnum.string,
+  [VariableInputEnum.custom]: WorkflowIOValueTypeEnum.any
+};
diff --git a/projects/app/src/web/core/workflow/utils.ts b/projects/app/src/web/core/workflow/utils.ts
index f34329886..032489a4d 100644
--- a/projects/app/src/web/core/workflow/utils.ts
+++ b/projects/app/src/web/core/workflow/utils.ts
@@ -374,10 +374,7 @@ export const getWorkflowGlobalVariables = ({
       systemConfigNode: getGuideModule(nodes),
       isPublicFetch: true
     })?.variables || []
-  ).map((item) => ({
-    ...item,
-    valueType: WorkflowIOValueTypeEnum.any
-  }));
+  );
 
   const systemVariables = getSystemVariables(t);