diff --git a/backend/python/app/api/admin/asset_admin.py b/backend/python/app/api/admin/asset_admin.py
new file mode 100644
index 0000000..6743f92
--- /dev/null
+++ b/backend/python/app/api/admin/asset_admin.py
@@ -0,0 +1,357 @@
+"""
+资产中心管理 API（管理员）
+Phase 3.8: Asset Center Enhancement - Admin asset management, analytics, activity log
+"""
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from sqlalchemy import or_, func, desc, text
+from typing import Optional
+import json
+from datetime import datetime, timedelta
+
+from ...database import get_db, SessionLocal
+from ...models import Asset, AssetCategory, UserStorageQuota, User
+from ...auth import get_current_admin
+from ...middleware.log_service import LogService
+
+router = APIRouter()
+
+CATEGORY_LABELS = {
+    "file": "文件", "novel": "小说", "image": "图片",
+    "video": "视频", "audio": "音频", "custom": "自定义", "doc": "文档",
+}
+
+
+def _execute_raw(db, sql, params=None):
+    result = db.execute(text(sql), params or {})
+    try:
+        rows = result.fetchall()
+        return [dict(row._mapping) if hasattr(row, '_mapping') else dict(row) for row in rows]
+    except:
+        return []
+
+
+def _asset_to_dict(a):
+    return {
+        "id": a.id,
+        "user_id": a.user_id,
+        "name": a.name,
+        "category": a.category,
+        "sub_category": a.sub_category,
+        "file_type": a.file_type,
+        "size": a.size or 0,
+        "description": a.description,
+        "cover_url": a.cover_url,
+        "url": a.url,
+        "status": a.status,
+        "created_at": a.created_at.strftime('%Y-%m-%d %H:%M:%S') if a.created_at else None,
+        "updated_at": a.updated_at.strftime('%Y-%m-%d %H:%M:%S') if a.updated_at else None,
+    }
+
+
+# ============================================================
+# Stats / Overview
+# ============================================================
+
+@router.get("/stats", summary="资产中心总览")
+async def get_asset_stats(
+    admin_user=Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    """获取资产中心总览数据"""
+    # Total assets
+    total_assets = _execute_raw(db, "SELECT COUNT(*) as cnt FROM assets WHERE status = 'active'")
+    total = total_assets[0]["cnt"] if total_assets else 0
+
+    # Total size
+    total_size = _execute_raw(db, "SELECT COALESCE(SUM(size), 0) as sz FROM assets WHERE status = 'active'")
+    size = total_size[0]["sz"] if total_size else 0
+
+    # By category
+    cat_stats = _execute_raw(db, """
+        SELECT category, COUNT(*) as cnt, COALESCE(SUM(size), 0) as sz
+        FROM assets WHERE status = 'active'
+        GROUP BY category
+    """)
+
+    # By file type
+    type_stats = _execute_raw(db, """
+        SELECT COALESCE(file_type, 'unknown') as ft, COUNT(*) as cnt, COALESCE(SUM(size), 0) as sz
+        FROM assets WHERE status = 'active'
+        GROUP BY file_type
+        ORDER BY cnt DESC
+        LIMIT 10
+    """)
+
+    # Top users by storage
+    top_users = _execute_raw(db, """
+        SELECT a.user_id, u.username, u.avatar,
+               COUNT(*) as asset_count, COALESCE(SUM(a.size), 0) as total_size
+        FROM assets a
+        LEFT JOIN users u ON a.user_id = u.id
+        WHERE a.status = 'active'
+        GROUP BY a.user_id, u.username, u.avatar
+        ORDER BY total_size DESC
+        LIMIT 10
+    """)
+
+    # Storage quota summary
+    quota_stats = _execute_raw(db, """
+        SELECT
+            COUNT(*) as total_users,
+            COALESCE(SUM(quota_bytes), 0) as total_quota,
+            COALESCE(SUM(used_bytes), 0) as total_used
+        FROM user_storage_quotas
+    """)
+
+    # Recent 7 days trend
+    trend = []
+    for i in range(6, -1, -1):
+        date = (datetime.now() - timedelta(days=i)).strftime('%Y-%m-%d')
+        new_uploads = _execute_raw(db, """
+            SELECT COUNT(*) as cnt FROM assets
+            WHERE DATE(created_at) = :d AND status = 'active'
+        """, {"d": date})
+        trend.append({
+            "date": date,
+            "new_uploads": new_uploads[0]["cnt"] if new_uploads else 0,
+        })
+
+    # Categories list
+    categories = _execute_raw(db, """
+        SELECT type, COUNT(*) as cnt FROM asset_categories GROUP BY type
+    """)
+
+    return {
+        "code": 0,
+        "data": {
+            "total_assets": total,
+            "total_size": size,
+            "total_size_formatted": _format_size(size),
+            "by_category": [{
+                "category": r["category"],
+                "label": CATEGORY_LABELS.get(r["category"], r["category"]),
+                "count": r["cnt"],
+                "size": r["sz"],
+                "size_formatted": _format_size(r["sz"]),
+            } for r in cat_stats],
+            "by_file_type": [{
+                "file_type": r["ft"],
+                "count": r["cnt"],
+                "size": r["sz"],
+                "size_formatted": _format_size(r["sz"]),
+            } for r in type_stats],
+            "top_users": [{
+                "user_id": r["user_id"],
+                "username": r["username"] or "Unknown",
+                "avatar": r["avatar"],
+                "asset_count": r["asset_count"],
+                "total_size": r["total_size"],
+                "total_size_formatted": _format_size(r["total_size"]),
+            } for r in top_users],
+            "quota_summary": {
+                "total_users": quota_stats[0]["total_users"] if quota_stats else 0,
+                "total_quota": quota_stats[0]["total_quota"] if quota_stats else 0,
+                "total_used": quota_stats[0]["total_used"] if quota_stats else 0,
+                "total_quota_formatted": _format_size(quota_stats[0]["total_quota"]) if quota_stats else "0",
+                "total_used_formatted": _format_size(quota_stats[0]["total_used"]) if quota_stats else "0",
+                "usage_percent": round((quota_stats[0]["total_used"] / quota_stats[0]["total_quota"] * 100), 2) if quota_stats and quota_stats[0]["total_quota"] > 0 else 0,
+            },
+            "trend_7d": trend,
+            "categories": [{"type": r["type"], "count": r["cnt"]} for r in categories],
+        }
+    }
+
+
+def _format_size(bytes_val):
+    if not bytes_val or bytes_val == 0:
+        return "0 B"
+    if bytes_val < 1024:
+        return f"{bytes_val} B"
+    if bytes_val < 1024 * 1024:
+        return f"{bytes_val / 1024:.1f} KB"
+    if bytes_val < 1024 * 1024 * 1024:
+        return f"{bytes_val / (1024 * 1024):.1f} MB"
+    return f"{bytes_val / (1024 * 1024 * 1024):.2f} GB"
+
+
+# ============================================================
+# Asset list & management
+# ============================================================
+
+@router.get("/", summary="List all assets")
+async def list_all_assets(
+    user_id: str = Query(None),
+    category: str = Query(None),
+    file_type: str = Query(None),
+    keyword: str = Query(None),
+    status: str = Query("active"),
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=100),
+    admin_user=Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    """List all user assets"""
+    where_clauses = []
+    params = {}
+    if status:
+        where_clauses.append("a.status = :status")
+        params["status"] = status
+    if user_id:
+        where_clauses.append("a.user_id = :uid")
+        params["uid"] = user_id
+    if category:
+        where_clauses.append("a.category = :cat")
+        params["cat"] = category
+    if file_type:
+        where_clauses.append("a.file_type = :ft")
+        params["ft"] = file_type
+    if keyword:
+        where_clauses.append("(a.name LIKE :kw OR a.description LIKE :kw)")
+        params["kw"] = "%" + keyword + "%"
+
+    where_sql = " AND ".join(where_clauses)
+    where_clause = "WHERE " + where_sql if where_sql else ""
+
+    count_sql = "SELECT COUNT(*) as cnt FROM assets a " + where_clause
+    count_rows = _execute_raw(db, count_sql, params)
+    total = count_rows[0]["cnt"] if count_rows else 0
+
+    offset = (page - 1) * page_size
+    list_sql = "SELECT a.id, a.user_id, a.name, a.category, a.sub_category, a.file_type, a.size, a.description, a.cover_url, a.url, a.status, a.created_at, a.updated_at, u.username, u.avatar FROM assets a LEFT JOIN users u ON a.user_id = u.id " + where_clause + " ORDER BY a.created_at DESC LIMIT :limit OFFSET :offset"
+    list_params = dict(params)
+    list_params["limit"] = page_size
+    list_params["offset"] = offset
+    rows = _execute_raw(db, list_sql, list_params)
+
+    items = []
+    for r in rows:
+        items.append({
+            "id": r["id"], "user_id": r["user_id"], "name": r["name"],
+            "category": r["category"], "sub_category": r["sub_category"],
+            "file_type": r["file_type"], "size": r["size"] or 0,
+            "size_formatted": _format_size(r["size"] or 0),
+            "description": r["description"], "cover_url": r["cover_url"],
+            "url": r["url"], "status": r["status"],
+            "username": r["username"] or "Unknown", "avatar": r["avatar"],
+            "created_at": r["created_at"].strftime("%Y-%m-%d %H:%M:%S") if r["created_at"] else None,
+            "updated_at": r["updated_at"].strftime("%Y-%m-%d %H:%M:%S") if r["updated_at"] else None,
+        })
+
+    return {"code": 0, "data": {"total": total, "page": page, "page_size": page_size, "items": items}}
+
+
+
+@router.delete("/{asset_id}", summary="管理员删除资产")
+async def admin_delete_asset(
+    asset_id: str,
+    admin_user=Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    """管理员删除用户资产"""
+    asset = db.query(Asset).filter(Asset.id == asset_id).first()
+    if not asset:
+        raise HTTPException(status_code=404, detail="资产不存在")
+
+    asset_name = asset.name
+    asset.status = "deleted"
+    asset.updated_at = datetime.now()
+    db.commit()
+
+    LogService.log_action(db, "admin", admin_user["id"], "delete_asset", f"Deleted asset: {asset_name}")
+
+    return {"code": 0, "message": "资产已删除"}
+
+
+@router.get("/activity", summary="最近资产活动")
+async def get_asset_activity(
+    limit: int = Query(30, le=100),
+    admin_user=Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    """获取最近的资产活动"""
+    activities = _execute_raw(db, """
+        SELECT a.id, a.name, a.category, a.file_type, a.size, a.status,
+               a.user_id, u.username, u.avatar,
+               a.created_at, a.updated_at
+        FROM assets a
+        LEFT JOIN users u ON a.user_id = u.id
+        ORDER BY a.updated_at DESC
+        LIMIT :lim
+    """, {"lim": limit})
+
+    return {
+        "code": 0,
+        "data": [{
+            "id": r["id"],
+            "name": r["name"],
+            "category": r["category"],
+            "category_label": CATEGORY_LABELS.get(r["category"], r["category"]),
+            "file_type": r["file_type"],
+            "size": r["size"] or 0,
+            "size_formatted": _format_size(r["size"] or 0),
+            "status": r["status"],
+            "user_id": r["user_id"],
+            "username": r["username"] or "Unknown",
+            "avatar": r["avatar"],
+            "created_at": r["created_at"].strftime('%Y-%m-%d %H:%M:%S') if r["created_at"] else None,
+            "updated_at": r["updated_at"].strftime('%Y-%m-%d %H:%M:%S') if r["updated_at"] else None,
+        } for r in activities]
+    }
+
+
+@router.get("/users/{user_id}/detail", summary="用户资产详情")
+async def get_user_asset_detail(
+    user_id: str,
+    admin_user=Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    """获取指定用户的资产详情"""
+    # User info
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="用户不存在")
+
+    # Asset stats
+    stats = _execute_raw(db, """
+        SELECT category, COUNT(*) as cnt, COALESCE(SUM(size), 0) as sz
+        FROM assets WHERE user_id = :uid AND status = 'active'
+        GROUP BY category
+    """, {"uid": user_id})
+
+    total = _execute_raw(db, """
+        SELECT COUNT(*) as cnt, COALESCE(SUM(size), 0) as sz
+        FROM assets WHERE user_id = :uid AND status = 'active'
+    """, {"uid": user_id})
+
+    # Quota
+    quota = db.query(UserStorageQuota).filter(UserStorageQuota.user_id == user_id).first()
+
+    return {
+        "code": 0,
+        "data": {
+            "user": {
+                "id": user.id,
+                "username": user.username,
+                "avatar": user.avatar,
+                "membership_level": user.membership_level,
+            },
+            "total_assets": total[0]["cnt"] if total else 0,
+            "total_size": total[0]["sz"] if total else 0,
+            "total_size_formatted": _format_size(total[0]["sz"]) if total else "0 B",
+            "by_category": [{
+                "category": r["category"],
+                "label": CATEGORY_LABELS.get(r["category"], r["category"]),
+                "count": r["cnt"],
+                "size": r["sz"],
+                "size_formatted": _format_size(r["sz"]),
+            } for r in stats],
+            "quota": {
+                "quota_bytes": quota.quota_bytes if quota else 0,
+                "used_bytes": quota.used_bytes if quota else 0,
+                "quota_formatted": _format_size(quota.quota_bytes) if quota else "0 B",
+                "used_formatted": _format_size(quota.used_bytes) if quota else "0 B",
+                "usage_percent": round((quota.used_bytes / quota.quota_bytes * 100), 2) if quota and quota.quota_bytes > 0 else 0,
+            } if quota else None,
+        }
+    }
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 4af19dd..8712b40 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -42,6 +42,7 @@ const AdminAutomation = lazy(() => import('@/pages/admin/Automation'));
 const AdminDeveloper = lazy(() => import('@/pages/admin/Developer'));
 const AdminMcp = lazy(() => import('@/pages/admin/Mcp'));
 const AdminStorage = lazy(() => import('@/pages/admin/Storage'));
+const AdminAssetCenter = lazy(() => import('@/pages/admin/AssetCenter'));
 const AdminWorkflow = lazy(() => import('@/pages/admin/Workflow'));
 
 // Loading fallback
@@ -128,6 +129,7 @@ const App: React.FC = () => {
             <Route path="settings" element={<AdminSiteSettings />} />
             <Route path="logs" element={<AdminLogs />} />
             <Route path="storage" element={<AdminStorage />} />
+            <Route path="asset-center" element={<AdminAssetCenter />} />
             <Route path="automation" element={<AdminAutomation />} />
             <Route path="developer" element={<AdminDeveloper />} />
           </Route>
diff --git a/frontend/src/api/index.ts b/frontend/src/api/index.ts
index 9f5e8b2..eed55e0 100644
--- a/frontend/src/api/index.ts
+++ b/frontend/src/api/index.ts
@@ -509,7 +509,11 @@ export const adminAPI = {
   syncAdminKnowledge: (kbId: string, data: any) => post<any>(`/admin/knowledge/external/sync/${kbId}`, data),
   batchDeleteAdminKnowledge: (ids: string[]) => post<any>('/admin/knowledge/batch/delete', ids),
   // OSS存储配置 (Phase 3.1)
-  getAdminStorageStats: () => get<any>('/admin/storage/stats/overview'),
+  getAssetStats: () => get<any>('/admin/assets/stats'),
+    getAdminAssets: (query: string) => get<any>(`/admin/assets/?${query}`),
+    deleteAdminAsset: (id: string) => del<any>(`/admin/assets/${id}`),
+    getAssetActivity: () => get<any>('/admin/assets/activity'),
+    getAdminStorageStats: () => get<any>('/admin/storage/stats/overview'),
   getAdminStorageConfigs: (params?: any) => {
     const query = params ? '?' + Object.entries(params).filter(([_, v]) => v !== undefined && v !== '').map(([k, v]) => `${k}=${v}`).join('&') : '';
     return get<any>(`/admin/storage/${query}`);
diff --git a/frontend/src/components/layout/AdminLayout.tsx b/frontend/src/components/layout/AdminLayout.tsx
index f839239..a8ddf63 100644
--- a/frontend/src/components/layout/AdminLayout.tsx
+++ b/frontend/src/components/layout/AdminLayout.tsx
@@ -56,6 +56,7 @@ const navGroups: NavGroup[] = [
       { path: '/admin/settings', icon: 'settings', label: '站点设置' },
       { path: '/admin/logs', icon: 'logs', label: '日志管理' },
       { path: '/admin/storage', icon: 'storage', label: '存储管理' },
+    { path: '/admin/asset-center', icon: 'database', label: '资产中心' },
       { path: '/admin/automation', icon: 'automation', label: '自动化任务' },
       { path: '/admin/developer', icon: 'developer', label: '开发者工具' },
     ],