diff --git a/packages/services/conversation-service/src/domain/entities/token-usage.entity.ts b/packages/services/conversation-service/src/domain/entities/token-usage.entity.ts
index 1ef0cfb..8a35a68 100644
--- a/packages/services/conversation-service/src/domain/entities/token-usage.entity.ts
+++ b/packages/services/conversation-service/src/domain/entities/token-usage.entity.ts
@@ -56,7 +56,7 @@ export class TokenUsageEntity {
   estimatedCost: number;
 
   // 意图类型
-  @Column({ name: 'intent_type', length: 30, nullable: true })
+  @Column({ name: 'intent_type', type: 'varchar', length: 30, nullable: true })
   intentType: string | null;
 
   // 工具调用次数