diff --git a/backend/services/authorization-service/Dockerfile b/backend/services/authorization-service/Dockerfile
index 27addec5..85c2a843 100644
--- a/backend/services/authorization-service/Dockerfile
+++ b/backend/services/authorization-service/Dockerfile
@@ -11,11 +11,15 @@ COPY prisma ./prisma/
 RUN npm ci
 
 # Generate Prisma client (dummy DATABASE_URL for build time only)
-RUN DATABASE_URL="postgresql://user:pass@localhost:5432/db" npx prisma generate
+# Force regenerate to ensure latest schema is used
+RUN rm -rf node_modules/.prisma && DATABASE_URL="postgresql://user:pass@localhost:5432/db" npx prisma generate
 
 # Copy source code
 COPY . .
 
+# Regenerate Prisma client after COPY to ensure latest schema is used
+RUN DATABASE_URL="postgresql://user:pass@localhost:5432/db" npx prisma generate
+
 # Build application
 RUN npm run build
 
diff --git a/backend/services/authorization-service/prisma/migrations/20251214100000_add_last_month_trees_added/migration.sql b/backend/services/authorization-service/prisma/migrations/20251214100000_add_last_month_trees_added/migration.sql
new file mode 100644
index 00000000..6c84dcec
--- /dev/null
+++ b/backend/services/authorization-service/prisma/migrations/20251214100000_add_last_month_trees_added/migration.sql
@@ -0,0 +1,10 @@
+-- 添加上月新增树数字段（用于月度考核存档）
+-- 业务规则：每月1日0:00，将 monthly_trees_added 存档到 last_month_trees_added，然后重置 monthly_trees_added
+-- 考核时根据 benefit_valid_until 判断使用哪个字段
+
+ALTER TABLE "authorization_roles"
+ADD COLUMN IF NOT EXISTS "last_month_trees_added" INTEGER NOT NULL DEFAULT 0;
+
+-- 添加注释
+COMMENT ON COLUMN "authorization_roles"."last_month_trees_added" IS '上月新增树数（考核用存档）';
+COMMENT ON COLUMN "authorization_roles"."monthly_trees_added" IS '当月新增树数（实时累计）';
diff --git a/backend/services/authorization-service/prisma/schema.prisma b/backend/services/authorization-service/prisma/schema.prisma
index fd43f757..af9c1d67 100644
--- a/backend/services/authorization-service/prisma/schema.prisma
+++ b/backend/services/authorization-service/prisma/schema.prisma
@@ -45,6 +45,7 @@ model AuthorizationRole {
   // 月度考核追踪
   lastAssessmentMonth       String?  @map("last_assessment_month")  // 上次考核月份 YYYY-MM
   monthlyTreesAdded         Int      @default(0) @map("monthly_trees_added")  // 当月新增树数
+  lastMonthTreesAdded       Int      @default(0) @map("last_month_trees_added")  // 上月新增树数（考核用存档）
 
   // 当前考核月份索引
   currentMonthIndex         Int      @default(0) @map("current_month_index")
diff --git a/backend/services/authorization-service/src/application/schedulers/monthly-assessment.scheduler.ts b/backend/services/authorization-service/src/application/schedulers/monthly-assessment.scheduler.ts
index 13ac747e..f4f87aa9 100644
--- a/backend/services/authorization-service/src/application/schedulers/monthly-assessment.scheduler.ts
+++ b/backend/services/authorization-service/src/application/schedulers/monthly-assessment.scheduler.ts
@@ -209,31 +209,42 @@ export class MonthlyAssessmentScheduler {
   }
 
   /**
-   * 每月1号凌晨0点重置所有社区的月度新增树数
+   * 每月1号凌晨0点存档并重置所有社区的月度新增树数
    *
-   * 注意：此任务必须在 processExpiredCommunityBenefits 之前执行
-   * 因为要先检查上月的考核情况，再重置计数器
+   * 业务规则：
+   * - 将当月业绩存档到 lastMonthTreesAdded（用于月度考核）
+   * - 重置 monthlyTreesAdded 为0（开始新月累计）
+   *
+   * 注意：考核时会根据 benefitValidUntil 判断使用哪个月的数据
+   * - 有效期在上月末 → 用 lastMonthTreesAdded
+   * - 有效期在当月末 → 用 monthlyTreesAdded
    */
   @Cron('0 0 1 * *')
-  async resetMonthlyTreeCounts(): Promise<void> {
-    this.logger.log('[resetMonthlyTreeCounts] 开始重置月度新增树数...')
+  async archiveAndResetMonthlyTreeCounts(): Promise<void> {
+    this.logger.log('[archiveAndResetMonthlyTreeCounts] 开始存档并重置月度新增树数...')
 
     try {
       // 获取所有激活的社区
       const activeCommunities = await this.authorizationRepository.findAllActive(RoleType.COMMUNITY)
 
-      let resetCount = 0
+      let archivedCount = 0
       for (const community of activeCommunities) {
-        if (community.benefitActive && community.monthlyTreesAdded > 0) {
-          community.resetMonthlyTrees()
+        if (community.benefitActive) {
+          // 存档当月数据到 lastMonthTreesAdded，然后重置 monthlyTreesAdded
+          community.archiveAndResetMonthlyTrees()
           await this.authorizationRepository.save(community)
-          resetCount++
+          archivedCount++
+
+          this.logger.debug(
+            `[archiveAndResetMonthlyTreeCounts] 社区 ${community.userId.accountSequence}: ` +
+            `存档=${community.lastMonthTreesAdded}, 当月已重置=0`,
+          )
         }
       }
 
-      this.logger.log(`[resetMonthlyTreeCounts] 重置完成: 已重置 ${resetCount} 个社区的月度计数`)
+      this.logger.log(`[archiveAndResetMonthlyTreeCounts] 存档完成: 已处理 ${archivedCount} 个社区`)
     } catch (error) {
-      this.logger.error('[resetMonthlyTreeCounts] 月度树数重置失败', error)
+      this.logger.error('[archiveAndResetMonthlyTreeCounts] 月度树数存档失败', error)
     }
   }
 }
diff --git a/backend/services/authorization-service/src/application/services/authorization-application.service.ts b/backend/services/authorization-service/src/application/services/authorization-application.service.ts
index 1214ab0a..36c80dfd 100644
--- a/backend/services/authorization-service/src/application/services/authorization-application.service.ts
+++ b/backend/services/authorization-service/src/application/services/authorization-application.service.ts
@@ -1049,30 +1049,34 @@ export class AuthorizationApplicationService {
     for (const community of expiredCommunities) {
       const accountSequence = community.userId.accountSequence
 
-      // 获取团队统计数据，检查月度新增树数
-      const teamStats = await this.statsRepository.findByAccountSequence(accountSequence)
-      const monthlyTreesAdded = community.monthlyTreesAdded
+      // 使用 getTreesForAssessment 获取正确的考核数据
+      // - 有效期在上月末 → 用 lastMonthTreesAdded（存档数据）
+      // - 有效期在当月末 → 用 monthlyTreesAdded（当月数据）
+      const treesForAssessment = community.getTreesForAssessment(now)
 
       this.logger.debug(
         `[processExpiredCommunityBenefits] Checking community ${accountSequence}: ` +
-        `monthlyTreesAdded=${monthlyTreesAdded}, target=10`,
+        `treesForAssessment=${treesForAssessment}, ` +
+        `monthlyTreesAdded=${community.monthlyTreesAdded}, ` +
+        `lastMonthTreesAdded=${community.lastMonthTreesAdded}, ` +
+        `benefitValidUntil=${community.benefitValidUntil?.toISOString()}, target=10`,
       )
 
-      if (monthlyTreesAdded >= 10) {
+      if (treesForAssessment >= 10) {
         // 达标，续期
-        community.renewBenefit(monthlyTreesAdded)
+        community.renewBenefit(treesForAssessment)
         await this.authorizationRepository.save(community)
         renewedCount++
 
         this.logger.log(
           `[processExpiredCommunityBenefits] Community ${accountSequence} renewed, ` +
-          `new validUntil=${community.benefitValidUntil?.toISOString()}`,
+          `trees=${treesForAssessment}, new validUntil=${community.benefitValidUntil?.toISOString()}`,
         )
       } else {
         // 不达标，级联停用
         const result = await this.cascadeDeactivateCommunityBenefits(
           accountSequence,
-          `月度考核不达标：本月新增${monthlyTreesAdded}棵，未达到10棵目标`,
+          `月度考核不达标：考核期内新增${treesForAssessment}棵，未达到10棵目标`,
         )
         deactivatedCount += result.deactivatedCount
       }
diff --git a/backend/services/authorization-service/src/domain/aggregates/authorization-role.aggregate.ts b/backend/services/authorization-service/src/domain/aggregates/authorization-role.aggregate.ts
index 5b62af9e..17a7fae3 100644
--- a/backend/services/authorization-service/src/domain/aggregates/authorization-role.aggregate.ts
+++ b/backend/services/authorization-service/src/domain/aggregates/authorization-role.aggregate.ts
@@ -46,6 +46,7 @@ export interface AuthorizationRoleProps {
   benefitValidUntil: Date | null  // 权益有效期截止日期
   lastAssessmentMonth: string | null  // 上次考核月份 YYYY-MM
   monthlyTreesAdded: number  // 当月新增树数
+  lastMonthTreesAdded: number  // 上月新增树数（考核用存档）
   currentMonthIndex: number
   createdAt: Date
   updatedAt: Date
@@ -83,6 +84,7 @@ export class AuthorizationRole extends AggregateRoot {
   // 月度考核追踪
   private _lastAssessmentMonth: string | null
   private _monthlyTreesAdded: number
+  private _lastMonthTreesAdded: number  // 上月新增树数（考核用存档）
 
   // 当前考核月份索引
   private _currentMonthIndex: number
@@ -154,6 +156,9 @@ export class AuthorizationRole extends AggregateRoot {
   get monthlyTreesAdded(): number {
     return this._monthlyTreesAdded
   }
+  get lastMonthTreesAdded(): number {
+    return this._lastMonthTreesAdded
+  }
   get currentMonthIndex(): number {
     return this._currentMonthIndex
   }
@@ -191,6 +196,7 @@ export class AuthorizationRole extends AggregateRoot {
     this._benefitValidUntil = props.benefitValidUntil
     this._lastAssessmentMonth = props.lastAssessmentMonth
     this._monthlyTreesAdded = props.monthlyTreesAdded
+    this._lastMonthTreesAdded = props.lastMonthTreesAdded
     this._currentMonthIndex = props.currentMonthIndex
     this._createdAt = props.createdAt
     this._updatedAt = props.updatedAt
@@ -251,6 +257,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: null,
       lastAssessmentMonth: null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: 0,
       createdAt: new Date(),
       updatedAt: new Date(),
@@ -298,6 +305,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: skipAssessment ? AuthorizationRole.calculateBenefitValidUntil(now) : null,
       lastAssessmentMonth: skipAssessment ? AuthorizationRole.getCurrentMonthString(now) : null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: skipAssessment ? 1 : 0,
       createdAt: now,
       updatedAt: now,
@@ -344,6 +352,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: null,
       lastAssessmentMonth: null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: 0,
       createdAt: now,
       updatedAt: now,
@@ -393,6 +402,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: skipAssessment ? AuthorizationRole.calculateBenefitValidUntil(now) : null,
       lastAssessmentMonth: skipAssessment ? AuthorizationRole.getCurrentMonthString(now) : null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: skipAssessment ? 1 : 0,
       createdAt: now,
       updatedAt: now,
@@ -440,6 +450,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: null,
       lastAssessmentMonth: null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: 0,
       createdAt: now,
       updatedAt: now,
@@ -489,6 +500,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: skipAssessment ? AuthorizationRole.calculateBenefitValidUntil(now) : null,
       lastAssessmentMonth: skipAssessment ? AuthorizationRole.getCurrentMonthString(now) : null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: skipAssessment ? 1 : 0,
       createdAt: now,
       updatedAt: now,
@@ -539,6 +551,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: skipAssessment ? AuthorizationRole.calculateBenefitValidUntil(now) : null,
       lastAssessmentMonth: skipAssessment ? AuthorizationRole.getCurrentMonthString(now) : null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: skipAssessment ? 1 : 0,
       createdAt: now,
       updatedAt: now,
@@ -589,6 +602,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: skipAssessment ? AuthorizationRole.calculateBenefitValidUntil(now) : null,
       lastAssessmentMonth: skipAssessment ? AuthorizationRole.getCurrentMonthString(now) : null,
       monthlyTreesAdded: 0,
+      lastMonthTreesAdded: 0,
       currentMonthIndex: skipAssessment ? 1 : 0,
       createdAt: now,
       updatedAt: now,
@@ -653,6 +667,7 @@ export class AuthorizationRole extends AggregateRoot {
     this._benefitValidUntil = null
     this._lastAssessmentMonth = null
     this._monthlyTreesAdded = 0
+    this._lastMonthTreesAdded = 0
     this._currentMonthIndex = 0 // 重置月份索引
     this._updatedAt = now
 
@@ -691,11 +706,45 @@ export class AuthorizationRole extends AggregateRoot {
   }
 
   /**
-   * 重置月度新增树数（每月初调用）
+   * 存档并重置月度新增树数（每月1日0:00调用）
+   * 将当月数据存档到 lastMonthTreesAdded，然后重置当月计数器
+   */
+  archiveAndResetMonthlyTrees(): void {
+    this._lastMonthTreesAdded = this._monthlyTreesAdded  // 存档
+    this._monthlyTreesAdded = 0  // 重置
+    this._updatedAt = new Date()
+  }
+
+  /**
+   * 获取用于考核的树数
+   * 根据 benefitValidUntil 判断使用上月还是当月数据
+   * - 如果有效期在上月末或更早 → 用 lastMonthTreesAdded
+   * - 如果有效期在当月末 → 用 monthlyTreesAdded
+   */
+  getTreesForAssessment(checkDate: Date = new Date()): number {
+    if (!this._benefitValidUntil) return 0
+
+    const validUntilMonth = this._benefitValidUntil.getMonth()
+    const validUntilYear = this._benefitValidUntil.getFullYear()
+    const checkMonth = checkDate.getMonth()
+    const checkYear = checkDate.getFullYear()
+
+    // 如果有效期年月 < 检查年月，说明有效期在上月或更早
+    if (validUntilYear < checkYear ||
+        (validUntilYear === checkYear && validUntilMonth < checkMonth)) {
+      // 有效期在上月末或更早 → 用存档数据
+      return this._lastMonthTreesAdded
+    } else {
+      // 有效期在当月末 → 用当月数据
+      return this._monthlyTreesAdded
+    }
+  }
+
+  /**
+   * @deprecated 使用 archiveAndResetMonthlyTrees 代替
    */
   resetMonthlyTrees(): void {
-    this._monthlyTreesAdded = 0
-    this._updatedAt = new Date()
+    this.archiveAndResetMonthlyTrees()
   }
 
   /**
@@ -853,6 +902,7 @@ export class AuthorizationRole extends AggregateRoot {
       benefitValidUntil: this._benefitValidUntil,
       lastAssessmentMonth: this._lastAssessmentMonth,
       monthlyTreesAdded: this._monthlyTreesAdded,
+      lastMonthTreesAdded: this._lastMonthTreesAdded,
       currentMonthIndex: this._currentMonthIndex,
       createdAt: this._createdAt,
       updatedAt: this._updatedAt,
diff --git a/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts b/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts
index debf551b..67bfc76e 100644
--- a/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts
+++ b/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts
@@ -46,6 +46,7 @@ export class AuthorizationRoleRepositoryImpl implements IAuthorizationRoleReposi
         benefitValidUntil: data.benefitValidUntil,
         lastAssessmentMonth: data.lastAssessmentMonth,
         monthlyTreesAdded: data.monthlyTreesAdded,
+        lastMonthTreesAdded: data.lastMonthTreesAdded,
         currentMonthIndex: data.currentMonthIndex,
       },
       update: {
@@ -64,6 +65,7 @@ export class AuthorizationRoleRepositoryImpl implements IAuthorizationRoleReposi
         benefitValidUntil: data.benefitValidUntil,
         lastAssessmentMonth: data.lastAssessmentMonth,
         monthlyTreesAdded: data.monthlyTreesAdded,
+        lastMonthTreesAdded: data.lastMonthTreesAdded,
         currentMonthIndex: data.currentMonthIndex,
       },
     })
@@ -393,6 +395,7 @@ export class AuthorizationRoleRepositoryImpl implements IAuthorizationRoleReposi
       benefitValidUntil: record.benefitValidUntil,
       lastAssessmentMonth: record.lastAssessmentMonth,
       monthlyTreesAdded: record.monthlyTreesAdded ?? 0,
+      lastMonthTreesAdded: record.lastMonthTreesAdded ?? 0,
       currentMonthIndex: record.currentMonthIndex,
       createdAt: record.createdAt,
       updatedAt: record.updatedAt,