diff --git a/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts b/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts
index b508fdf1..992943db 100644
--- a/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts
+++ b/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts
@@ -372,7 +372,10 @@ export async function submitClaimUid(
   }
 
   if (executorKey === 'affiliate_dash') {
-    updatedTask = (await bindAffiliateDashClaimForTask(updatedTask, expectedUid)) || updatedTask
+    updatedTask =
+      (await bindAffiliateDashClaimForTask(updatedTask, expectedUid, {
+        keepExistingBindOnUidUpdate: shouldKeepAffiliateDashBindOnUidUpdate(),
+      })) || updatedTask
   }
 
   return getKuaishouCloudClaimDetail(token)
@@ -548,7 +551,11 @@ export async function submitAffiliateDashClaim(
  * 提交 UID 后触发 affiliate-dash 绑定（bind），把 bind_uuid / 二维码写回上下文，
  * task → waiting_binding（link_generated → waiting_binding 合法）。
  */
-async function bindAffiliateDashClaimForTask(task: TaskRow, gameAccount: string) {
+async function bindAffiliateDashClaimForTask(
+  task: TaskRow,
+  gameAccount: string,
+  options: { keepExistingBindOnUidUpdate?: boolean } = {},
+) {
   const taskContext = parseTaskContextValue(task)
   const flow = normalizeAffiliateDashFlow(taskContext.affiliateDash)
   if (!flow.orderNo || !gameAccount) {
@@ -556,6 +563,42 @@ async function bindAffiliateDashClaimForTask(task: TaskRow, gameAccount: string)
   }
 
   const now = nowIso()
+  const shouldReuseExistingBind = Boolean(
+    options.keepExistingBindOnUidUpdate &&
+      flow.bindUuid &&
+      flow.bound &&
+      flow.boundAccount &&
+      normalizeUid(flow.boundAccount) === normalizeUid(gameAccount),
+  )
+  if (shouldReuseExistingBind) {
+    const nextFlow = {
+      ...flow,
+      gameAccount,
+      expectedGameAccount: gameAccount,
+      bindMismatch: false,
+    }
+    const updatedTask = await updateTask(task.id, {
+      task_status: TASK_STATUS.WAITING_BINDING,
+      context_json: JSON.stringify({
+        ...taskContext,
+        affiliateDash: nextFlow,
+      }),
+      updated_at: now,
+    })
+    await createTaskEvent(
+      task.id,
+      'affiliate_dash_bind_reused_for_uid_update',
+      {
+        orderNo: flow.orderNo,
+        bindUuid: flow.bindUuid,
+        gameAccount,
+        boundAccount: flow.boundAccount,
+      },
+      now,
+    )
+    return updatedTask || task
+  }
+
   const bindResult = await bindAffiliateDashDelivery({
     orderNo: flow.orderNo,
     gameAccount,
@@ -648,6 +691,11 @@ async function refreshAffiliateDashBindState(task: TaskRow): Promise<TaskRow | n
   }
 }
 
+function shouldKeepAffiliateDashBindOnUidUpdate() {
+  const value = String(process.env.AFFILIATE_DASH_KEEP_BIND_ON_UID_UPDATE || '').trim().toLowerCase()
+  return value === '1' || value === 'true' || value === 'yes' || value === 'on'
+}
+
 function normalizeUid(value: unknown) {
   return String(value || '')
     .trim()