diff --git a/backend/services/contribution-service/src/application/services/contribution-calculation.service.ts b/backend/services/contribution-service/src/application/services/contribution-calculation.service.ts
index 1da79d54..8e67ce58 100644
--- a/backend/services/contribution-service/src/application/services/contribution-calculation.service.ts
+++ b/backend/services/contribution-service/src/application/services/contribution-calculation.service.ts
@@ -13,7 +13,7 @@ import { SyncedReferral } from '../../domain/repositories/synced-data.repository
 import { ContributionDistributionPublisherService } from './contribution-distribution-publisher.service';
 import { ContributionRateService } from './contribution-rate.service';
 import { BonusClaimService } from './bonus-claim.service';
-import { ContributionRecordSyncedEvent, NetworkProgressUpdatedEvent, ContributionAccountUpdatedEvent } from '../../domain/events';
+import { ContributionRecordSyncedEvent, NetworkProgressUpdatedEvent, ContributionAccountUpdatedEvent, SystemAccountSyncedEvent } from '../../domain/events';
 
 /**
  * 算力计算应用服务
@@ -280,7 +280,7 @@ export class ContributionCalculationService {
       );
     }
 
-    // 5. 保存系统账户算力
+    // 5. 保存系统账户算力并发布同步事件
     if (result.systemContributions.length > 0) {
       await this.systemAccountRepository.ensureSystemAccountsExist();
 
@@ -295,6 +295,23 @@ export class ContributionCalculationService {
           effectiveDate,
           expireDate: null, // System account contributions never expire based on the schema's contributionNeverExpires field
         });
+
+        // 发布系统账户同步事件（用于 mining-service 同步系统账户算力）
+        const systemAccount = await this.systemAccountRepository.findByType(sys.accountType);
+        if (systemAccount) {
+          const event = new SystemAccountSyncedEvent(
+            sys.accountType,
+            systemAccount.name,
+            systemAccount.contributionBalance.value.toString(),
+            systemAccount.createdAt,
+          );
+          await this.outboxRepository.save({
+            aggregateType: SystemAccountSyncedEvent.AGGREGATE_TYPE,
+            aggregateId: sys.accountType,
+            eventType: SystemAccountSyncedEvent.EVENT_TYPE,
+            payload: event.toPayload(),
+          });
+        }
       }
     }