diff --git a/backend/services/contribution-service/src/application/services/bonus-claim.service.ts b/backend/services/contribution-service/src/application/services/bonus-claim.service.ts
index 47f8048c..0b432f0e 100644
--- a/backend/services/contribution-service/src/application/services/bonus-claim.service.ts
+++ b/backend/services/contribution-service/src/application/services/bonus-claim.service.ts
@@ -591,13 +591,17 @@ export class BonusClaimService {
     expectedLevelDepth: number,
     expectedBonusTiers: number,
   ): Promise<void> {
-    // 增量更新直推认种数
-    const previousCount = account.directReferralAdoptedCount;
-    if (newDirectReferralAdoptedCount > previousCount) {
-      for (let i = previousCount; i < newDirectReferralAdoptedCount; i++) {
-        account.incrementDirectReferralAdoptedCount();
-      }
-    }
+    // 使用 setDirectReferralAdoptedCount 无条件重算解锁状态。
+    //
+    // 不能用「if (newCount > previousCount) increment」的方式，原因：
+    //   当直推已全部认种（DB count 已正确）但 markAsAdopted() 在此之后才
+    //   被调用时，markAsAdopted 会硬编码 level=5/bonus=1，导致 level 错误，
+    //   但 count 不变，条件判断永远为 false，backfill 无法修复。
+    //
+    // setDirectReferralAdoptedCount 内部调用 updateUnlockStatus()，
+    // 无论 count 是否变化都会根据 hasAdopted + count 重新计算正确的
+    // unlockedLevelDepth 和 unlockedBonusTiers。
+    account.setDirectReferralAdoptedCount(newDirectReferralAdoptedCount);
 
     await this.contributionAccountRepository.save(account);
 
diff --git a/backend/services/contribution-service/src/infrastructure/persistence/repositories/synced-data.repository.ts b/backend/services/contribution-service/src/infrastructure/persistence/repositories/synced-data.repository.ts
index 3fa94be3..e46d4f4d 100644
--- a/backend/services/contribution-service/src/infrastructure/persistence/repositories/synced-data.repository.ts
+++ b/backend/services/contribution-service/src/infrastructure/persistence/repositories/synced-data.repository.ts
@@ -291,11 +291,14 @@ export class SyncedDataRepository implements ISyncedDataRepository {
 
     const accountSequences = directReferrals.map((r) => r.accountSequence);
 
-    // 只统计有 MINING_ENABLED 状态认种记录的直推用户数
+    // 解锁阈值按「人头」计：常规认种和预种均以「该直推用户是否有任意一条
+    // MINING_ENABLED 记录」为准，每人算 1，不论认种了几棵树或几份预种。
+    // 预种 handler 会在用户首次付款时向 synced_adoptions 插入一条
+    // treeCount=0、status=MINING_ENABLED 的 marker，确保预种用户也能被计入。
     const adoptedCount = await this.client.syncedAdoption.findMany({
       where: {
         accountSequence: { in: accountSequences },
-        status: 'MINING_ENABLED', // 只统计最终成功的认种订单
+        status: 'MINING_ENABLED',
       },
       distinct: ['accountSequence'],
     });