diff --git a/web/app/components/workflow/nodes/trigger-webhook/components/generic-table.tsx b/web/app/components/workflow/nodes/trigger-webhook/components/generic-table.tsx
index 2b784a28a2..31a29121ac 100644
--- a/web/app/components/workflow/nodes/trigger-webhook/components/generic-table.tsx
+++ b/web/app/components/workflow/nodes/trigger-webhook/components/generic-table.tsx
@@ -8,6 +8,11 @@ import { SimpleSelect } from '@/app/components/base/select'
 import { replaceSpaceWithUnderscoreInVarNameInput } from '@/utils/var'
 import cn from '@/utils/classnames'
 
+// Tiny utility to judge whether a cell value is effectively present
+const isPresent = (v: unknown): boolean => {
+  if (typeof v === 'string') return v.trim() !== ''
+  return !(v === '' || v === null || v === undefined || v === false)
+}
 // Column configuration types for table components
 export type ColumnType = 'input' | 'select' | 'switch' | 'custom'
 
@@ -120,6 +125,11 @@ const GenericTable: FC<GenericTableProps> = ({
     onChange(next)
   }, [data, emptyRowData, onChange, readonly])
 
+  // Determine the primary identifier column just once
+  const primaryKey = useMemo(() => (
+    columns.find(col => col.key === 'key' || col.key === 'name')?.key ?? 'key'
+  ), [columns])
+
   const renderCell = (column: ColumnConfig, row: GenericTableRow, dataIndex: number | null) => {
     const value = row[column.key]
     const handleChange = (newValue: unknown) => updateRow(dataIndex, column.key, newValue)
@@ -218,8 +228,8 @@ const GenericTable: FC<GenericTableProps> = ({
             const rowKey = `row-${renderIndex}`
 
             // Check if primary identifier column has content
-            const primaryColumn = columns.find(col => col.key === 'key' || col.key === 'name')?.key || 'key'
-            const hasContent = row[primaryColumn] && String(row[primaryColumn]).trim() !== ''
+            const primaryValue = row[primaryKey]
+            const hasContent = isPresent(primaryValue)
 
             return (
               <div
diff --git a/web/app/components/workflow/nodes/trigger-webhook/components/parameter-table.tsx b/web/app/components/workflow/nodes/trigger-webhook/components/parameter-table.tsx
index e89903e638..7268e9e38d 100644
--- a/web/app/components/workflow/nodes/trigger-webhook/components/parameter-table.tsx
+++ b/web/app/components/workflow/nodes/trigger-webhook/components/parameter-table.tsx
@@ -13,6 +13,7 @@ const normalizeParamType = (type: string): ParameterType => {
     case 'boolean':
     case 'array':
     case 'object':
+    case 'file':
       return type
     default:
       return 'string'
@@ -27,6 +28,7 @@ type ParameterTableProps = {
   placeholder?: string
   showType?: boolean
   isRequestBody?: boolean // Special handling for request body parameters
+  contentType?: string
 }
 
 const ParameterTable: FC<ParameterTableProps> = ({
@@ -37,17 +39,63 @@ const ParameterTable: FC<ParameterTableProps> = ({
   placeholder,
   showType = true,
   isRequestBody = false,
+  contentType,
 }) => {
   const { t } = useTranslation()
 
-  // Type options for request body parameters
-  const typeOptions = [
-    { name: 'String', value: 'string' },
-    { name: 'Number', value: 'number' },
-    { name: 'Boolean', value: 'boolean' },
-    { name: 'Array', value: 'array' },
-    { name: 'Object', value: 'object' },
-  ]
+  const resolveTypeOptions = (): { name: string; value: ParameterType }[] => {
+    if (!isRequestBody) {
+      return [
+        { name: 'String', value: 'string' },
+      ]
+    }
+
+    const ct = (contentType || '').toLowerCase()
+    // application/json -> all JSON-friendly types
+    if (ct === 'application/json') {
+      return [
+        { name: 'String', value: 'string' },
+        { name: 'Number', value: 'number' },
+        { name: 'Boolean', value: 'boolean' },
+        { name: 'Array', value: 'array' },
+        { name: 'Object', value: 'object' },
+      ]
+    }
+    // text/plain -> plain text only
+    if (ct === 'text/plain') {
+      return [
+        { name: 'String', value: 'string' },
+      ]
+    }
+    // x-www-form-urlencoded and forms -> simple key-value pairs
+    if (ct === 'application/x-www-form-urlencoded' || ct === 'forms') {
+      return [
+        { name: 'String', value: 'string' },
+        { name: 'Number', value: 'number' },
+        { name: 'Boolean', value: 'boolean' },
+      ]
+    }
+    // multipart/form-data -> allow file additionally
+    if (ct === 'multipart/form-data') {
+      return [
+        { name: 'String', value: 'string' },
+        { name: 'Number', value: 'number' },
+        { name: 'Boolean', value: 'boolean' },
+        { name: 'File', value: 'file' },
+      ]
+    }
+
+    // Fallback: all json-like types
+    return [
+      { name: 'String', value: 'string' },
+      { name: 'Number', value: 'number' },
+      { name: 'Boolean', value: 'boolean' },
+      { name: 'Array', value: 'array' },
+      { name: 'Object', value: 'object' },
+    ]
+  }
+
+  const typeOptions = resolveTypeOptions()
 
   // Define columns based on component type - matching prototype design
   const columns: ColumnConfig[] = [
@@ -76,10 +124,16 @@ const ParameterTable: FC<ParameterTableProps> = ({
     },
   ]
 
+  // Choose sensible default type for new rows according to content type
+  const defaultTypeValue = ((): ParameterType => {
+    const first = typeOptions[0]?.value
+    return first || 'string'
+  })()
+
   // Empty row template for new rows
   const emptyRowData: GenericTableRow = {
     key: '',
-    type: isRequestBody ? 'string' : '',
+    type: isRequestBody ? defaultTypeValue : '',
     required: false,
   }
 
@@ -90,13 +144,21 @@ const ParameterTable: FC<ParameterTableProps> = ({
   }))
 
   const handleDataChange = (data: GenericTableRow[]) => {
-    const newParams: WebhookParameter[] = data
+    // For text/plain, enforce single text body semantics: keep only first non-empty row and force string type
+    const isTextPlain = isRequestBody && (contentType || '').toLowerCase() === 'text/plain'
+
+    const normalized = data
       .filter(row => typeof row.key === 'string' && (row.key as string).trim() !== '')
       .map(row => ({
         name: String(row.key),
-        type: normalizeParamType((row.type as string) || 'string'),
+        type: isTextPlain ? 'string' : normalizeParamType((row.type as string) || 'string'),
         required: Boolean(row.required),
       }))
+
+    const newParams: WebhookParameter[] = isTextPlain
+      ? normalized.slice(0, 1)
+      : normalized
+
     onChange(newParams)
   }
 
diff --git a/web/app/components/workflow/nodes/trigger-webhook/panel.tsx b/web/app/components/workflow/nodes/trigger-webhook/panel.tsx
index 77352e90a8..1dc979b7a9 100644
--- a/web/app/components/workflow/nodes/trigger-webhook/panel.tsx
+++ b/web/app/components/workflow/nodes/trigger-webhook/panel.tsx
@@ -173,6 +173,7 @@ const Panel: FC<NodePanelProps<WebhookTriggerNodeType>> = ({
           placeholder={t(`${i18nPrefix}.noBodyParameters`)}
           showType={true}
           isRequestBody={true}
+          contentType={inputs['content-type']}
         />
 
         <Split />
diff --git a/web/app/components/workflow/nodes/trigger-webhook/types.ts b/web/app/components/workflow/nodes/trigger-webhook/types.ts
index f065e670d8..9e06da4f1a 100644
--- a/web/app/components/workflow/nodes/trigger-webhook/types.ts
+++ b/web/app/components/workflow/nodes/trigger-webhook/types.ts
@@ -4,7 +4,7 @@ import type { ErrorHandleTypeEnum } from '@/app/components/workflow/nodes/_base/
 
 export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'DELETE' | 'PATCH' | 'HEAD'
 
-export type ParameterType = 'string' | 'number' | 'boolean' | 'array' | 'object'
+export type ParameterType = 'string' | 'number' | 'boolean' | 'array' | 'object' | 'file'
 
 export type WebhookParameter = {
   name: string