diff --git a/src/modules/admin-costs/admin-costs.controller.ts b/src/modules/admin-costs/admin-costs.controller.ts
index a9dcf3d..c067f28 100644
--- a/src/modules/admin-costs/admin-costs.controller.ts
+++ b/src/modules/admin-costs/admin-costs.controller.ts
@@ -1,6 +1,8 @@
-import { Controller, Get, Post, Patch, Delete, Body, Param, UseGuards } from '@nestjs/common';
-import { ApiTags, ApiBearerAuth } from '@nestjs/swagger';
+import { Controller, Get, Post, Patch, Delete, Body, Param, Query, Res, UseGuards } from '@nestjs/common';
+import { ApiTags, ApiBearerAuth, ApiOperation } from '@nestjs/swagger';
+import type { Response } from 'express';
 import { AdminCostsService } from './admin-costs.service';
+import { CostAggregationService } from './cost-aggregation.service';
 import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
 import { AdminRoles } from '../../common/decorators/admin-roles.decorator';
 import type { AdminRole } from '../../common/types/admin-role.enum';
@@ -10,11 +12,52 @@ import type { AdminRole } from '../../common/types/admin-role.enum';
 @UseGuards(AdminAuthGuard)
 @ApiBearerAuth()
 export class AdminCostsController {
-  constructor(private readonly svc: AdminCostsService) {}
+  constructor(
+    private readonly svc: AdminCostsService,
+    private readonly costAgg: CostAggregationService,
+  ) {}
 
   @Get() @AdminRoles('SUPER_ADMIN' as AdminRole) async list() { return this.svc.list(); }
   @Get('summary') @AdminRoles('SUPER_ADMIN' as AdminRole) async summary() { return this.svc.summary(); }
   @Post() @AdminRoles('SUPER_ADMIN' as AdminRole) async create(@Body() d: any) { return this.svc.create(d); }
   @Patch(':id') @AdminRoles('SUPER_ADMIN' as AdminRole) async update(@Param('id') id: string, @Body() d: any) { return this.svc.update(id, d); }
   @Delete(':id') @AdminRoles('SUPER_ADMIN' as AdminRole) async delete(@Param('id') id: string) { return this.svc.delete(id); }
+
+  // ── AI Cost Report ──
+
+  @Get('report')
+  @AdminRoles('SUPER_ADMIN' as AdminRole)
+  @ApiOperation({ summary: 'AI 成本报表（按provider/模型/日趋势）' })
+  async report(@Query('days') days = '30') {
+    return this.costAgg.getReport(parseInt(days));
+  }
+
+  @Post('aggregate')
+  @AdminRoles('SUPER_ADMIN' as AdminRole)
+  @ApiOperation({ summary: '手动触发成本汇总' })
+  async aggregate() {
+    await this.costAgg.aggregateToday();
+    return { success: true };
+  }
+
+  @Get('export-csv')
+  @AdminRoles('SUPER_ADMIN' as AdminRole)
+  @ApiOperation({ summary: '导出成本 CSV' })
+  async exportCsv(@Query('days') days = '30', @Res() res: Response) {
+    const csv = await this.costAgg.exportCsv(parseInt(days));
+    res.setHeader('Content-Type', 'text/csv; charset=utf-8');
+    res.setHeader('Content-Disposition', `attachment; filename="cost-report-${days}d.csv"`);
+    res.send(csv);
+  }
+
+  // ── Top consumers ──
+
+  @Get('top-users')
+  @AdminRoles('SUPER_ADMIN' as AdminRole)
+  @ApiOperation({ summary: 'Top 消耗用户' })
+  async topUsers(@Query('days') days = '30', @Query('limit') limit = '10') {
+    const since = new Date(Date.now() - parseInt(days) * 86400000);
+    const top = await this.svc.getTopConsumers(since, parseInt(limit));
+    return { top, days: parseInt(days) };
+  }
 }
diff --git a/src/modules/admin-costs/admin-costs.module.ts b/src/modules/admin-costs/admin-costs.module.ts
index 7c33760..c029324 100644
--- a/src/modules/admin-costs/admin-costs.module.ts
+++ b/src/modules/admin-costs/admin-costs.module.ts
@@ -1,7 +1,8 @@
 import { Module } from '@nestjs/common';
 import { AdminCostsController } from './admin-costs.controller';
 import { AdminCostsService } from './admin-costs.service';
+import { CostAggregationService } from './cost-aggregation.service';
 import { PrismaService } from '../../infrastructure/database/prisma.service';
 import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
-@Module({ controllers: [AdminCostsController], providers: [AdminCostsService, PrismaService, AdminAuthGuard] })
+@Module({ controllers: [AdminCostsController], providers: [AdminCostsService, CostAggregationService, PrismaService, AdminAuthGuard] })
 export class AdminCostsModule {}
diff --git a/src/modules/admin-costs/admin-costs.service.ts b/src/modules/admin-costs/admin-costs.service.ts
index 70e8a2a..6cb699c 100644
--- a/src/modules/admin-costs/admin-costs.service.ts
+++ b/src/modules/admin-costs/admin-costs.service.ts
@@ -80,4 +80,21 @@ export class AdminCostsService {
       expiringSoon: expiringSoon.sort((a: any, b: any) => a.daysLeft - b.daysLeft),
     };
   }
+
+  async getTopConsumers(since: Date, limit: number) {
+    const top = await this.prisma.aiUsageLog.groupBy({
+      by: ['userId'],
+      where: { createdAt: { gte: since } },
+      _sum: { estimatedCost: true, inputTokens: true, outputTokens: true },
+      _count: { id: true },
+      orderBy: { _sum: { estimatedCost: 'desc' } },
+      take: limit,
+    });
+    return top.map(t => ({
+      userId: t.userId,
+      calls: t._count.id,
+      tokens: (t._sum.inputTokens || 0) + (t._sum.outputTokens || 0),
+      cost: (t._sum.estimatedCost || 0).toFixed(4),
+    }));
+  }
 }
diff --git a/src/modules/admin-costs/cost-aggregation.service.ts b/src/modules/admin-costs/cost-aggregation.service.ts
new file mode 100644
index 0000000..53485da
--- /dev/null
+++ b/src/modules/admin-costs/cost-aggregation.service.ts
@@ -0,0 +1,107 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { PrismaService } from '../../infrastructure/database/prisma.service';
+
+@Injectable()
+export class CostAggregationService {
+  private readonly logger = new Logger(CostAggregationService.name);
+
+  constructor(private readonly prisma: PrismaService) {}
+
+  /** Aggregate today's AiUsageLog into CostDailySummary */
+  async aggregateToday(): Promise<void> {
+    const today = new Date(); today.setHours(0, 0, 0, 0);
+    const tomorrow = new Date(today); tomorrow.setDate(tomorrow.getDate() + 1);
+
+    const logs = await this.prisma.aiUsageLog.findMany({
+      where: { createdAt: { gte: today, lt: tomorrow }, success: true },
+      select: { provider: true, model: true, inputTokens: true, outputTokens: true, estimatedCost: true },
+    });
+
+    if (logs.length === 0) return;
+
+    // Group by provider+model
+    const groups: Record<string, { calls: number; tokens: number; cost: number }> = {};
+    for (const l of logs) {
+      const key = `${l.provider}|${l.model}`;
+      if (!groups[key]) groups[key] = { calls: 0, tokens: 0, cost: 0 };
+      groups[key].calls++;
+      groups[key].tokens += l.inputTokens + l.outputTokens;
+      groups[key].cost += l.estimatedCost;
+    }
+
+    // Upsert into CostDailySummary
+    for (const [key, data] of Object.entries(groups)) {
+      const [provider, model] = key.split('|');
+      await this.prisma.costDailySummary.upsert({
+        where: { date_provider_model: { date: today, provider, model } },
+        update: { calls: data.calls, tokens: data.tokens, cost: data.cost },
+        create: { date: today, provider, model, calls: data.calls, tokens: data.tokens, cost: data.cost },
+      });
+    }
+
+    this.logger.log(`Aggregated ${logs.length} AI calls into CostDailySummary`);
+  }
+
+  /** Get cost report by time range */
+  async getReport(days = 30) {
+    const since = new Date(Date.now() - days * 86400000);
+
+    const [byProvider, byModel, dailyTrend] = await Promise.all([
+      this.prisma.costDailySummary.groupBy({
+        by: ['provider'],
+        where: { date: { gte: since } },
+        _sum: { calls: true, tokens: true, cost: true },
+      }),
+      this.prisma.costDailySummary.groupBy({
+        by: ['model'],
+        where: { date: { gte: since } },
+        _sum: { calls: true, tokens: true, cost: true },
+      }),
+      this.prisma.costDailySummary.findMany({
+        where: { date: { gte: since } },
+        orderBy: { date: 'asc' },
+      }),
+    ]);
+
+    const totalCost = byProvider.reduce((s, p) => s + (p._sum.cost || 0), 0);
+    const totalCalls = byProvider.reduce((s, p) => s + (p._sum.calls || 0), 0);
+
+    return {
+      period: `${days} days`,
+      totalCost: totalCost.toFixed(4),
+      totalCalls,
+      byProvider: byProvider.map(p => ({
+        provider: p.provider,
+        calls: p._sum.calls || 0,
+        tokens: p._sum.tokens || 0,
+        cost: (p._sum.cost || 0).toFixed(4),
+      })),
+      byModel: byModel.map(m => ({
+        model: m.model,
+        calls: m._sum.calls || 0,
+        tokens: m._sum.tokens || 0,
+        cost: (m._sum.cost || 0).toFixed(4),
+      })),
+      dailyTrend: dailyTrend.map(d => ({
+        date: d.date.toISOString().slice(0, 10),
+        provider: d.provider,
+        model: d.model,
+        calls: d.calls,
+        cost: d.cost,
+      })),
+    };
+  }
+
+  /** Generate CSV export string */
+  async exportCsv(days = 30): Promise<string> {
+    const since = new Date(Date.now() - days * 86400000);
+    const rows = await this.prisma.costDailySummary.findMany({
+      where: { date: { gte: since } },
+      orderBy: { date: 'asc' },
+    });
+
+    const header = 'date,provider,model,calls,tokens,cost';
+    const lines = rows.map(r => `${r.date.toISOString().slice(0,10)},${r.provider},${r.model},${r.calls},${r.tokens},${r.cost}`);
+    return [header, ...lines].join('\n');
+  }
+}
diff --git a/test/m1.e2e-spec.ts b/test/m1.e2e-spec.ts
index 339786e..258eb6e 100644
--- a/test/m1.e2e-spec.ts
+++ b/test/m1.e2e-spec.ts
@@ -323,4 +323,50 @@ describe('M1 E2E Tests', () => {
       expect(res.body.data).toHaveProperty('queues');
     });
   });
+
+  // ══════════════════════════════════════════════
+  // M1-06: Quota/Cost 闭环
+  // ══════════════════════════════════════════════
+  describe('M1-06 Quota/Cost Closing', () => {
+    let token: string;
+    beforeAll(async () => { token = await loginAdmin(); });
+
+    it('GET /admin-api/costs/report → 200 AI cost report', async () => {
+      if (!token) return;
+      const res = await request(app.getHttpServer())
+        .get('/admin-api/costs/report?days=30')
+        .set('Authorization', `Bearer ${token}`)
+        .expect(200);
+      expect(res.body.data).toHaveProperty('totalCost');
+      expect(res.body.data).toHaveProperty('byProvider');
+      expect(res.body.data).toHaveProperty('dailyTrend');
+    });
+
+    it('POST /admin-api/costs/aggregate → 200 trigger aggregation', async () => {
+      if (!token) return;
+      const res = await request(app.getHttpServer())
+        .post('/admin-api/costs/aggregate')
+        .set('Authorization', `Bearer ${token}`)
+        .expect([200, 201]);
+      expect(res.body.success).toBe(true);
+    });
+
+    it('GET /admin-api/costs/top-users → 200 top consumers', async () => {
+      if (!token) return;
+      const res = await request(app.getHttpServer())
+        .get('/admin-api/costs/top-users?days=30&limit=10')
+        .set('Authorization', `Bearer ${token}`)
+        .expect(200);
+      expect(res.body.data).toHaveProperty('top');
+    });
+
+    it('GET /admin-api/costs/export-csv → 200 CSV download', async () => {
+      if (!token) return;
+      const res = await request(app.getHttpServer())
+        .get('/admin-api/costs/export-csv?days=7')
+        .set('Authorization', `Bearer ${token}`)
+        .expect(200);
+      expect(res.headers['content-type']).toContain('text/csv');
+    });
+  });
 });