diff --git a/apps/server/src/routes/license.tsx b/apps/server/src/routes/license.tsx
index 0da359e..5106af9 100644
--- a/apps/server/src/routes/license.tsx
+++ b/apps/server/src/routes/license.tsx
@@ -14,6 +14,7 @@ export const Route = createFileRoute('/license')({
 function License() {
   const [licenseInput, setLicenseInput] = useState('')
   const [copySuccess, setCopySuccess] = useState(false)
+  const [showDeactivateConfirm, setShowDeactivateConfirm] = useState(false)
   const queryClient = useQueryClient()
 
   // 获取激活状态
@@ -32,11 +33,26 @@ function License() {
     },
   })
 
+  // 反激活 mutation
+  const deactivateMutation = useMutation({
+    ...orpc.license.deactivate.mutationOptions(),
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: orpc.license.getActivation.key(),
+      })
+      setShowDeactivateConfirm(false)
+    },
+  })
+
   const handleActivate = () => {
     if (!licenseInput.trim()) return
     activateMutation.mutate({ license: licenseInput.trim() })
   }
 
+  const handleDeactivate = () => {
+    deactivateMutation.mutate()
+  }
+
   const handleCopyFingerprint = async () => {
     try {
       await navigator.clipboard.writeText(data.fingerprint)
@@ -352,6 +368,62 @@ function License() {
                     </p>
                   )}
                 </div>
+
+                {!showDeactivateConfirm ? (
+                  <button
+                    type="button"
+                    onClick={() => setShowDeactivateConfirm(true)}
+                    className="mt-4 px-4 py-2 bg-red-500 text-white rounded-lg text-sm font-medium hover:bg-red-600 transition-colors shadow-sm"
+                  >
+                    反激活
+                  </button>
+                ) : (
+                  <div className="mt-4 p-4 bg-red-50 rounded-lg border border-red-200">
+                    <p className="text-red-700 text-sm mb-3 flex items-center gap-2">
+                      <svg
+                        aria-hidden="true"
+                        xmlns="http://www.w3.org/2000/svg"
+                        width="16"
+                        height="16"
+                        viewBox="0 0 24 24"
+                        fill="none"
+                        stroke="currentColor"
+                        strokeWidth="2"
+                        strokeLinecap="round"
+                        strokeLinejoin="round"
+                      >
+                        <path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3Z" />
+                        <path d="M12 9v4" />
+                        <path d="M12 17h.01" />
+                      </svg>
+                      确定要反激活吗？此操作会清除当前 License。
+                    </p>
+                    <div className="flex gap-2">
+                      <button
+                        type="button"
+                        onClick={handleDeactivate}
+                        disabled={deactivateMutation.isPending}
+                        className="px-4 py-2 bg-red-600 text-white rounded-md text-sm font-medium hover:bg-red-700 disabled:bg-gray-300 transition-colors"
+                      >
+                        {deactivateMutation.isPending
+                          ? '反激活中...'
+                          : '确认反激活'}
+                      </button>
+                      <button
+                        type="button"
+                        onClick={() => setShowDeactivateConfirm(false)}
+                        className="px-4 py-2 bg-gray-200 text-gray-700 rounded-md text-sm font-medium hover:bg-gray-300 transition-colors"
+                      >
+                        取消
+                      </button>
+                    </div>
+                    {deactivateMutation.isError && (
+                      <p className="text-red-500 mt-2 text-xs">
+                        反激活失败，请重试
+                      </p>
+                    )}
+                  </div>
+                )}
               </div>
             ) : (
               <div className="flex items-start gap-3">
diff --git a/apps/server/src/server/api/contracts/license.contract.ts b/apps/server/src/server/api/contracts/license.contract.ts
index ce86419..7d7220e 100644
--- a/apps/server/src/server/api/contracts/license.contract.ts
+++ b/apps/server/src/server/api/contracts/license.contract.ts
@@ -12,3 +12,7 @@ export const getActivation = oc.input(z.void()).output(
 export const activate = oc
   .input(z.object({ license: z.string().min(1) }))
   .output(z.object({ success: z.boolean() }))
+
+export const deactivate = oc
+  .input(z.void())
+  .output(z.object({ success: z.boolean() }))
diff --git a/apps/server/src/server/api/routers/license.router.ts b/apps/server/src/server/api/routers/license.router.ts
index 43ab10a..6188b8e 100644
--- a/apps/server/src/server/api/routers/license.router.ts
+++ b/apps/server/src/server/api/routers/license.router.ts
@@ -43,3 +43,25 @@ export const activate = os.license.activate
 
     return { success: true }
   })
+
+export const deactivate = os.license.deactivate
+  .use(dbProvider)
+  .handler(async ({ context }) => {
+    await ensureLicenseActivationInitialized()
+
+    const record = await context.db.query.licenseActivationTable.findFirst()
+
+    if (!record) {
+      throw new Error('License activation record not found')
+    }
+
+    await context.db
+      .update(licenseActivationTable)
+      .set({
+        license: null,
+        licenseActivatedAt: null,
+      })
+      .where(eq(licenseActivationTable.id, record.id))
+
+    return { success: true }
+  })