diff --git a/oxlint-suppressions.json b/oxlint-suppressions.json
index 9d6abf0a5b4..623a6061d0c 100644
--- a/oxlint-suppressions.json
+++ b/oxlint-suppressions.json
@@ -4001,11 +4001,8 @@
     }
   },
   "web/app/components/workflow/nodes/loop/components/loop-variables/form-item.tsx": {
-    "no-restricted-imports": {
-      "count": 1
-    },
     "typescript/no-explicit-any": {
-      "count": 3
+      "count": 2
     }
   },
   "web/app/components/workflow/nodes/loop/components/loop-variables/item.tsx": {
diff --git a/web/app/components/workflow/nodes/loop/components/loop-variables/__tests__/form-item.spec.tsx b/web/app/components/workflow/nodes/loop/components/loop-variables/__tests__/form-item.spec.tsx
new file mode 100644
index 00000000000..044dff59773
--- /dev/null
+++ b/web/app/components/workflow/nodes/loop/components/loop-variables/__tests__/form-item.spec.tsx
@@ -0,0 +1,62 @@
+import type { LoopVariable } from '@/app/components/workflow/nodes/loop/types'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { useState } from 'react'
+import { ValueType, VarType } from '@/app/components/workflow/types'
+import FormItem from '../form-item'
+
+describe('Loop variable constant input', () => {
+  it('reports numeric edits and clearing as strings to the loop draft', async () => {
+    const user = userEvent.setup()
+    const onChange = vi.fn()
+    function LoopDraft() {
+      const [value, setValue] = useState('12')
+      return (
+        <FormItem
+          nodeId="loop-node"
+          item={{
+            id: 'count',
+            label: 'count',
+            var_type: VarType.number,
+            value_type: ValueType.constant,
+            value,
+          }}
+          onChange={(nextValue) => {
+            setValue(nextValue)
+            onChange(nextValue)
+          }}
+        />
+      )
+    }
+    render(<LoopDraft />)
+
+    const input = screen.getByRole('spinbutton', { name: 'count' })
+    await user.clear(input)
+    expect(onChange).toHaveBeenLastCalledWith('')
+    await user.type(input, '-3.5')
+    expect(input).toHaveValue(-3.5)
+    expect(onChange).toHaveBeenLastCalledWith('-3.5')
+  })
+
+  it.each([
+    [VarType.number, 'spinbutton'],
+    [VarType.string, 'textbox'],
+  ] as const)('names an unnamed %s constant until its variable is named', (varType, role) => {
+    const item: LoopVariable = {
+      id: 'new-variable',
+      label: '',
+      var_type: varType,
+      value_type: ValueType.constant,
+      value: '',
+    }
+    const { rerender } = render(<FormItem nodeId="loop-node" item={item} onChange={vi.fn()} />)
+    expect(
+      screen.getByRole(role, { name: 'workflow.errorMsg.fields.variableValue' }),
+    ).toBeInTheDocument()
+
+    rerender(
+      <FormItem nodeId="loop-node" item={{ ...item, label: 'counter' }} onChange={vi.fn()} />,
+    )
+    expect(screen.getByRole(role, { name: 'counter' })).toBeInTheDocument()
+  })
+})
diff --git a/web/app/components/workflow/nodes/loop/components/loop-variables/form-item.tsx b/web/app/components/workflow/nodes/loop/components/loop-variables/form-item.tsx
index 91a3f7df7e1..aa57b679bf4 100644
--- a/web/app/components/workflow/nodes/loop/components/loop-variables/form-item.tsx
+++ b/web/app/components/workflow/nodes/loop/components/loop-variables/form-item.tsx
@@ -1,9 +1,9 @@
 import type { LoopVariable } from '@/app/components/workflow/nodes/loop/types'
 import type { Var } from '@/app/components/workflow/types'
+import { Input } from '@langgenius/dify-ui/input'
 import { Textarea } from '@langgenius/dify-ui/textarea'
 import { useCallback, useMemo } from 'react'
 import { useTranslation } from 'react-i18next'
-import Input from '@/app/components/base/input'
 import CodeEditor from '@/app/components/workflow/nodes/_base/components/editor/code-editor'
 import VarReferencePicker from '@/app/components/workflow/nodes/_base/components/variable/var-reference-picker'
 import { CodeLanguage } from '@/app/components/workflow/nodes/code/types'
@@ -26,17 +26,11 @@ type FormItemProps = {
 const FormItem = ({ nodeId, item, onChange }: FormItemProps) => {
   const { t } = useTranslation()
   const { value_type, var_type, value } = item
+  const valueLabel = item.label || t(($) => $['errorMsg.fields.variableValue'], { ns: 'workflow' })
   const normalizedVarValue = useMemo(() => {
     return Array.isArray(value) ? value : []
   }, [value])
 
-  const handleInputChange = useCallback(
-    (e: any) => {
-      onChange(e.target.value)
-    },
-    [onChange],
-  )
-
   const handleValueChange = useCallback(
     (value: string) => {
       onChange(value)
@@ -85,14 +79,21 @@ const FormItem = ({ nodeId, item, onChange }: FormItemProps) => {
       )}
       {value_type === ValueType.constant && var_type === VarType.string && (
         <Textarea
-          aria-label={item.label}
+          aria-label={valueLabel}
           value={value}
           onValueChange={handleValueChange}
           className="min-h-12 w-full"
         />
       )}
       {value_type === ValueType.constant && var_type === VarType.number && (
-        <Input type="number" value={value} onChange={handleInputChange} className="w-full" />
+        <Input
+          aria-label={valueLabel}
+          type="number"
+          value={value}
+          onValueChange={handleValueChange}
+          placeholder={t(($) => $['placeholder.input'], { ns: 'common' })}
+          className="w-full"
+        />
       )}
       {value_type === ValueType.constant && var_type === VarType.boolean && (
         <BoolValue value={value} onChange={handleChange} />