diff --git a/backend/src/services/contract.service.ts b/backend/src/services/contract.service.ts
index de7f813..d0e7702 100644
--- a/backend/src/services/contract.service.ts
+++ b/backend/src/services/contract.service.ts
@@ -232,6 +232,7 @@ export async function rehireEmployee(orgId: string, userId: string, id: string,
     data: {
       hireDate: newHireDate,
       status: 'ACTIVE',
+      department: data.department || employee.department,
       isPregnant: false,
       isInMedicalPeriod: false,
       isWorkInjured: false,
diff --git a/frontend/src/pages/Roster.tsx b/frontend/src/pages/Roster.tsx
index 93dcc40..9b8df84 100644
--- a/frontend/src/pages/Roster.tsx
+++ b/frontend/src/pages/Roster.tsx
@@ -809,6 +809,7 @@ function RehireModal({ employee, onClose, onSubmit, loading, error }: {
   })()
   const [form, setForm] = useState({
     hireDate: todayStr,
+    department: employee.department || '',
     contractType: 'FIXED' as 'FIXED' | 'UNFIXED' | 'UNSIGNED',
     signDate: '',
     startDate: todayStr,
@@ -908,6 +909,7 @@ function RehireModal({ employee, onClose, onSubmit, loading, error }: {
   const handleSubmit = () => {
     const data: any = {
       hireDate: new Date(form.hireDate).toISOString(),
+      department: form.department,
     }
     if (form.contractType !== 'UNSIGNED' && form.startDate) {
       data.contract = {
@@ -939,8 +941,8 @@ function RehireModal({ employee, onClose, onSubmit, loading, error }: {
             <div className="text-xs text-gray-600 py-1.5">{employee.name}</div>
           </div>
           <div>
-            <Label>部门</Label>
-            <div className="text-xs text-gray-600 py-1.5">{employee.department}</div>
+            <Label>部门 *</Label>
+            <Input value={form.department} onChange={(e) => setForm({ ...form, department: e.target.value })} placeholder="如：技术部" />
           </div>
         </div>
         <div>