diff --git a/packages/ui/src/components/form/pickers/TimePicker/TimePicker.test.tsx b/packages/ui/src/components/form/pickers/TimePicker/TimePicker.test.tsx
new file mode 100644
index 0000000..5749cfc
--- /dev/null
+++ b/packages/ui/src/components/form/pickers/TimePicker/TimePicker.test.tsx
@@ -0,0 +1,71 @@
+import { render, screen, within } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, expect, it, vi } from 'vitest'
+
+import { TimePicker } from './TimePicker'
+
+describe('TimePicker', () => {
+  it('exposes an accessible trigger and panel relationship', async () => {
+    const user = userEvent.setup()
+
+    render(<TimePicker aria-label="Start time" />)
+
+    const trigger = screen.getByRole('combobox', { name: 'Start time' })
+    expect(trigger).toHaveAttribute('aria-expanded', 'false')
+
+    await user.click(trigger)
+
+    expect(trigger).toHaveAttribute('aria-expanded', 'true')
+    expect(trigger).toHaveAttribute('aria-controls', screen.getByRole('dialog').id)
+    expect(screen.getByRole('group', { name: 'Hours' })).toBeInTheDocument()
+    expect(screen.getByRole('group', { name: 'Minutes' })).toBeInTheDocument()
+  })
+
+  it('opens and closes from the keyboard', async () => {
+    const user = userEvent.setup()
+
+    render(<TimePicker aria-label="Start time" />)
+
+    const trigger = screen.getByRole('combobox', { name: 'Start time' })
+    trigger.focus()
+
+    await user.keyboard('{Enter}')
+    expect(screen.getByRole('dialog')).toBeInTheDocument()
+
+    await user.keyboard('{Escape}')
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
+    expect(trigger).toHaveAttribute('aria-expanded', 'false')
+  })
+
+  it('selects hour and minute using native buttons', async () => {
+    const user = userEvent.setup()
+    const onChange = vi.fn()
+
+    render(<TimePicker aria-label="Start time" onChange={onChange} />)
+
+    await user.click(screen.getByRole('combobox', { name: 'Start time' }))
+    await user.click(
+      within(screen.getByRole('group', { name: 'Hours' })).getByRole('button', { name: '09' }),
+    )
+    await user.click(
+      within(screen.getByRole('group', { name: 'Minutes' })).getByRole('button', { name: '30' }),
+    )
+
+    expect(onChange).toHaveBeenLastCalledWith('09:30')
+    expect(screen.getByRole('combobox', { name: 'Start time' })).toHaveTextContent('09:30')
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
+  })
+
+  it('does not open while disabled', async () => {
+    const user = userEvent.setup()
+
+    render(<TimePicker aria-label="Start time" disabled />)
+
+    const trigger = screen.getByRole('combobox', { name: 'Start time' })
+    expect(trigger).toHaveAttribute('aria-disabled', 'true')
+
+    await user.click(trigger)
+
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
+  })
+})
diff --git a/packages/ui/src/components/form/pickers/TimePicker/TimePicker.tsx b/packages/ui/src/components/form/pickers/TimePicker/TimePicker.tsx
index d7b370b..ae4ce7b 100644
--- a/packages/ui/src/components/form/pickers/TimePicker/TimePicker.tsx
+++ b/packages/ui/src/components/form/pickers/TimePicker/TimePicker.tsx
@@ -1,4 +1,4 @@
-import { forwardRef, useState, useRef, useEffect, type HTMLAttributes } from 'react'
+import { forwardRef, useEffect, useId, useRef, useState, type HTMLAttributes } from 'react'
 import { cn } from '../../../../utils/cn'
 
 export interface TimePickerProps extends Omit<HTMLAttributes<HTMLDivElement>, 'onChange'> {
@@ -20,6 +20,9 @@ export const TimePicker = forwardRef<HTMLDivElement, TimePickerProps>(function T
     disabled = false,
     placeholder = '选择时间',
     onChange,
+    onKeyDown,
+    'aria-label': ariaLabel,
+    'aria-labelledby': ariaLabelledBy,
     size = 'md',
     ...props
   },
@@ -28,6 +31,7 @@ export const TimePicker = forwardRef<HTMLDivElement, TimePickerProps>(function T
   const [internal, setInternal] = useState(defaultValue)
   const [open, setOpen] = useState(false)
   const wrapperRef = useRef<HTMLDivElement>(null)
+  const panelId = useId()
   const val = controlledValue ?? internal
 
   const update = (v: string) => {
@@ -35,71 +39,117 @@ export const TimePicker = forwardRef<HTMLDivElement, TimePickerProps>(function T
     onChange?.(v)
   }
 
+  const closePanel = () => setOpen(false)
+
+  const togglePanel = () => {
+    if (!disabled) setOpen((current) => !current)
+  }
+
   useEffect(() => {
     if (!open) return
     const handler = (e: MouseEvent) => {
-      if (wrapperRef.current && !wrapperRef.current.contains(e.target as Node)) setOpen(false)
+      if (wrapperRef.current && !wrapperRef.current.contains(e.target as Node)) closePanel()
     }
     document.addEventListener('mousedown', handler)
     return () => document.removeEventListener('mousedown', handler)
   })
 
-  const hours = Array.from({ length: format === '24' ? 24 : 12 }, (_, i) => format === '24' ? i : i + 1)
+  const hours = Array.from({ length: format === '24' ? 24 : 12 }, (_, i) =>
+    format === '24' ? i : i + 1,
+  )
   const minutes = Array.from({ length: 60 }, (_, i) => i)
 
   const [selH, selM] = val ? val.split(':').map(Number) : [null, null]
 
   const heightCls = { 'h-8': size === 'sm', 'h-10': size === 'md', 'h-11': size === 'lg' }
+  const formatTime = (hour: number, minute: number) =>
+    `${String(hour).padStart(2, '0')}:${String(minute).padStart(2, '0')}`
 
   return (
     <div ref={wrapperRef} className={cn('relative inline-block', className)} {...props}>
       <div
         ref={ref}
+        role="combobox"
+        tabIndex={disabled ? -1 : 0}
+        aria-label={ariaLabel ?? (ariaLabelledBy ? undefined : placeholder)}
+        aria-labelledby={ariaLabelledBy}
+        aria-expanded={open}
+        aria-haspopup="dialog"
+        aria-controls={open ? panelId : undefined}
+        aria-disabled={disabled || undefined}
         className={cn(
-          'inline-flex w-40 cursor-pointer items-center rounded-md border border-slate-300 bg-white px-3 text-sm transition dark:border-slate-600 dark:bg-slate-800 dark:text-slate-100',
+          'nova-focus-ring inline-flex w-40 cursor-pointer items-center rounded-md border border-slate-300 bg-white px-3 text-sm transition dark:border-slate-600 dark:bg-slate-800 dark:text-slate-100',
           heightCls,
           disabled && 'cursor-not-allowed opacity-60',
         )}
-        onClick={() => !disabled && setOpen(!open)}
+        onClick={togglePanel}
+        onKeyDown={(event) => {
+          onKeyDown?.(event)
+          if (event.defaultPrevented || disabled) return
+
+          if (event.key === 'Enter' || event.key === ' ' || event.key === 'ArrowDown') {
+            event.preventDefault()
+            setOpen(true)
+            return
+          }
+
+          if (event.key === 'Escape') {
+            event.preventDefault()
+            closePanel()
+          }
+        }}
       >
         <span className={val ? '' : 'text-slate-400'}>{val || placeholder}</span>
         <span className="ml-auto text-slate-400">🕐</span>
       </div>
       {open ? (
-        <div className="absolute z-50 mt-1 flex rounded-md border border-slate-200 bg-white shadow-lg dark:border-slate-700 dark:bg-slate-800">
-          <div className="h-48 w-14 overflow-auto border-r border-slate-200 py-1 dark:border-slate-700">
+        <div
+          id={panelId}
+          role="dialog"
+          aria-label="Time picker panel"
+          className="absolute z-50 mt-1 flex rounded-md border border-slate-200 bg-white shadow-lg dark:border-slate-700 dark:bg-slate-800"
+        >
+          <div
+            role="group"
+            aria-label="Hours"
+            className="h-48 w-14 overflow-auto border-r border-slate-200 py-1 dark:border-slate-700"
+          >
             {hours.map((h) => (
-              <div
+              <button
                 key={h}
+                type="button"
+                aria-pressed={selH === h}
                 className={cn(
-                  'cursor-pointer px-2 py-1 text-center text-sm hover:bg-brand-50 dark:hover:bg-brand-900/20',
+                  'block w-full cursor-pointer px-2 py-1 text-center text-sm hover:bg-brand-50 focus:outline-none focus:ring-2 focus:ring-brand-500 dark:hover:bg-brand-900/20',
                   selH === h && 'bg-brand-500 text-white hover:bg-brand-600',
                 )}
-                onMouseDown={() => {
+                onClick={() => {
                   const m = selM ?? 0
-                  update(`${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}`)
+                  update(formatTime(h, m))
                 }}
               >
                 {String(h).padStart(2, '0')}
-              </div>
+              </button>
             ))}
           </div>
-          <div className="h-48 w-14 overflow-auto py-1">
+          <div role="group" aria-label="Minutes" className="h-48 w-14 overflow-auto py-1">
             {minutes.map((m) => (
-              <div
+              <button
                 key={m}
+                type="button"
+                aria-pressed={selM === m}
                 className={cn(
-                  'cursor-pointer px-2 py-1 text-center text-sm hover:bg-brand-50 dark:hover:bg-brand-900/20',
+                  'block w-full cursor-pointer px-2 py-1 text-center text-sm hover:bg-brand-50 focus:outline-none focus:ring-2 focus:ring-brand-500 dark:hover:bg-brand-900/20',
                   selM === m && 'bg-brand-500 text-white hover:bg-brand-600',
                 )}
-                onMouseDown={() => {
-                  const h = selH ?? 0
-                  update(`${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}`)
-                  setOpen(false)
+                onClick={() => {
+                  const h = selH ?? hours[0] ?? 0
+                  update(formatTime(h, m))
+                  closePanel()
                 }}
               >
                 {String(m).padStart(2, '0')}
-              </div>
+              </button>
             ))}
           </div>
         </div>