diff --git a/backend/services/mining-blockchain-service/src/infrastructure/kafka/adoption-injection-consumer.service.ts b/backend/services/mining-blockchain-service/src/infrastructure/kafka/adoption-injection-consumer.service.ts
index ccb8d4fa..0c83c68a 100644
--- a/backend/services/mining-blockchain-service/src/infrastructure/kafka/adoption-injection-consumer.service.ts
+++ b/backend/services/mining-blockchain-service/src/infrastructure/kafka/adoption-injection-consumer.service.ts
@@ -139,6 +139,16 @@ export class AdoptionInjectionConsumerService implements OnModuleInit, OnModuleD
             return;
           }
 
+          // 双保险：丢弃 2026-03-10 前的事件，防止历史积压消息触发意外注入
+          const CUTOFF_DATE = new Date('2026-03-10T00:00:00+08:00');
+          const eventCreatedAt = parsed.created_at ? new Date(parsed.created_at) : null;
+          if (!eventCreatedAt || eventCreatedAt < CUTOFF_DATE) {
+            this.logger.warn(
+              `[SKIP] AdoptionFusdtInjectionRequested event discarded: created_at=${parsed.created_at} is before cutoff ${CUTOFF_DATE.toISOString()}`,
+            );
+            return;
+          }
+
           this.logger.log(`[RECEIVE] AdoptionFusdtInjectionRequested event received`);
           this.logger.log(`[RECEIVE] offset=${message.offset}, partition=${partition}`);