diff --git a/apps/api/app/api/routes/asset_libraries.py b/apps/api/app/api/routes/asset_libraries.py
index af09c629f..a663f326e 100644
--- a/apps/api/app/api/routes/asset_libraries.py
+++ b/apps/api/app/api/routes/asset_libraries.py
@@ -5,6 +5,7 @@ from app.dependencies import get_asset_library_repository, get_project_repositor
 from app.schemas.asset_library import (
     AssetLibraryResponse,
     CreateAssetLibraryRequest,
+    EnsureDefaultLibraryRequest,
     ListAssetLibrariesResponse,
 )
 from fastapi import APIRouter, Depends, HTTPException, Query, status
@@ -15,7 +16,7 @@ from packages.application import (
     GetProjectUseCase,
     ListAssetLibrariesUseCase,
 )
-from packages.domain import AssetLibraryKind
+from packages.domain import AssetLibrary, AssetLibraryKind
 
 router = APIRouter()
 
@@ -43,6 +44,7 @@ def _to_asset_library_response(item) -> AssetLibraryResponse:
 @router.get("", response_model=ListAssetLibrariesResponse)
 def list_asset_libraries(
     project_id: str | None = Query(None),
+    kind: str | None = Query(None, pattern="^(video|voice|image)$"),
     authenticated_user: AuthenticatedUser = Depends(get_current_user),
     asset_library_repository: Any = Depends(get_asset_library_repository),
     project_repository: Any = Depends(get_project_repository),
@@ -66,6 +68,11 @@ def list_asset_libraries(
             all_items.extend(use_case.execute(proj.id))
         items = all_items
 
+    # 按 kind 过滤（可选）
+    if kind:
+        kind_enum = AssetLibraryKind(kind)
+        items = [item for item in items if item.kind == kind_enum]
+
     return ListAssetLibrariesResponse(items=[_to_asset_library_response(item) for item in items])
 
 
@@ -90,3 +97,53 @@ def create_asset_library(
         )
     )
     return _to_asset_library_response(item)
+
+
+# 默认素材库名称映射
+_DEFAULT_LIBRARY_NAMES = {
+    "video": "视频素材库",
+    "voice": "配音素材库",
+    "image": "图片素材库",
+}
+
+
+@router.post("/ensure-default", response_model=AssetLibraryResponse)
+def ensure_default_library(
+    request: EnsureDefaultLibraryRequest,
+    authenticated_user: AuthenticatedUser = Depends(get_current_user),
+    asset_library_repository: Any = Depends(get_asset_library_repository),
+    project_repository: Any = Depends(get_project_repository),
+) -> AssetLibraryResponse:
+    """确保项目下指定 kind 的默认素材库存在，已存在则直接返回，不存在则自动创建。"""
+    project = project_repository.find_by_id(request.project_id)
+    if project is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Project not found")
+    if not project.can_access(authenticated_user.user.id):
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Access denied to project")
+
+    kind = AssetLibraryKind(request.kind)
+
+    # 查找该项目下同 kind 的素材库，返回第一个
+    existing = asset_library_repository.find_by_project(request.project_id)
+    for lib in existing:
+        if lib.kind == kind:
+            return _to_asset_library_response(lib)
+
+    # 不存在 → 自动创建
+    import uuid
+    from datetime import datetime, timezone
+
+    now = datetime.now(timezone.utc)
+    default_name = _DEFAULT_LIBRARY_NAMES.get(request.kind, f"{request.kind}素材库")
+    library = AssetLibrary(
+        id=str(uuid.uuid4()),
+        project_id=request.project_id,
+        name=default_name,
+        kind=kind,
+        asset_count=0,
+        total_size=0,
+        created_at=now,
+        updated_at=now,
+    )
+    created = asset_library_repository.create(library)
+    return _to_asset_library_response(created)
diff --git a/apps/api/app/api/routes/assets.py b/apps/api/app/api/routes/assets.py
index 58c0ce30b..79cc7bf91 100644
--- a/apps/api/app/api/routes/assets.py
+++ b/apps/api/app/api/routes/assets.py
@@ -20,7 +20,6 @@ from fastapi import APIRouter, Depends, HTTPException, Query
 from packages.application import (
     CreateAssetCommand,
     CreateAssetUseCase,
-    ListAssetsUseCase,
 )
 from packages.domain import AssetStatus, ClassificationStatus
 
@@ -82,6 +81,8 @@ def list_assets(
     library_id: Optional[str] = Query(None),
     project_id: Optional[str] = Query(None),
     kind: Optional[str] = Query(None, pattern="^(video|voice|image)$"),
+    skip: int = Query(0, ge=0),
+    limit: int = Query(100, ge=1, le=500),
     authenticated_user: AuthenticatedUser = Depends(get_current_user),
     asset_repository: Any = Depends(get_asset_repository),
     asset_library_repository: Any = Depends(get_asset_library_repository),
@@ -105,28 +106,54 @@ def list_assets(
             raise HTTPException(status_code=404, detail=f"AssetLibrary {library_id} not found")
         _check_project_access(library.project_id, user_id, project_repository)
         if kind:
-            items = asset_repository.find_by_library_and_file_type(library_id, kind_to_file_type[kind])
+            items = asset_repository.find_by_library_and_file_type(
+                library_id, kind_to_file_type[kind], skip=skip, limit=limit
+            )
         else:
-            items = asset_repository.find_by_library(library_id)
-        return ListAssetsResponse(items=[_to_asset_response(item) for item in items])
+            items = asset_repository.find_by_library(library_id, skip=skip, limit=limit)
+        # 计算 total（不分页的全量数量）
+        all_items = asset_repository.find_by_library(library_id) if kind else items
+        total = len(_filter_by_kind(all_items)) if kind else len(all_items)
+        return ListAssetsResponse(
+            items=[_to_asset_response(item) for item in items],
+            total=total,
+            skip=skip,
+            limit=limit,
+        )
 
     # 模式2：指定 project_id → 返回该项目所有素材
     if project_id:
         _check_project_access(project_id, user_id, project_repository)
-        items = asset_repository.find_by_project(project_id)
-        return ListAssetsResponse(items=[_to_asset_response(item) for item in _filter_by_kind(items)])
+        all_items = asset_repository.find_by_project(project_id)
+        filtered = _filter_by_kind(all_items)
+        total = len(filtered)
+        paged = filtered[skip : skip + limit]
+        return ListAssetsResponse(
+            items=[_to_asset_response(item) for item in paged],
+            total=total,
+            skip=skip,
+            limit=limit,
+        )
 
     # 模式3：都不传 → 返回用户可访问的所有项目的所有素材
     try:
         projects = project_repository.find_accessible_projects(user_id)
     except Exception:
         logger.exception("查询用户可访问项目失败: user_id=%s", user_id)
-        return ListAssetsResponse(items=[])
+        return ListAssetsResponse(items=[], total=0, skip=skip, limit=limit)
 
     all_items = []
     for proj in projects:
         all_items.extend(asset_repository.find_by_project(proj.id))
-    return ListAssetsResponse(items=[_to_asset_response(item) for item in _filter_by_kind(all_items)])
+    filtered = _filter_by_kind(all_items)
+    total = len(filtered)
+    paged = filtered[skip : skip + limit]
+    return ListAssetsResponse(
+        items=[_to_asset_response(item) for item in paged],
+        total=total,
+        skip=skip,
+        limit=limit,
+    )
 
 
 def _apply_asset_review_status(item, review_status: str):
diff --git a/apps/api/app/schemas/asset.py b/apps/api/app/schemas/asset.py
index d08f40a57..8b783b539 100644
--- a/apps/api/app/schemas/asset.py
+++ b/apps/api/app/schemas/asset.py
@@ -55,3 +55,6 @@ class AssetResponse(BaseModel):
 
 class ListAssetsResponse(BaseModel):
     items: list[AssetResponse]
+    total: int = Field(default=0, ge=0)
+    skip: int = Field(default=0, ge=0)
+    limit: int = Field(default=100, ge=1)
diff --git a/apps/api/app/schemas/asset_library.py b/apps/api/app/schemas/asset_library.py
index 0277fe886..f5f4bf58b 100644
--- a/apps/api/app/schemas/asset_library.py
+++ b/apps/api/app/schemas/asset_library.py
@@ -18,3 +18,8 @@ class AssetLibraryResponse(BaseModel):
 
 class ListAssetLibrariesResponse(BaseModel):
     items: list[AssetLibraryResponse]
+
+
+class EnsureDefaultLibraryRequest(BaseModel):
+    project_id: str = Field(..., min_length=1)
+    kind: str = Field(..., pattern="^(video|voice|image)$")
diff --git a/apps/web/src/api/assets.ts b/apps/web/src/api/assets.ts
index 2e7a6de59..c2b064c0a 100644
--- a/apps/web/src/api/assets.ts
+++ b/apps/web/src/api/assets.ts
@@ -129,6 +129,35 @@ export const getAssets = async (libraryId: string): Promise<AssetItem[]> => {
   return response.data.items || [];
 };
 
+/** 按类型获取素材（如 voice/video/image） */
+export const getAssetsByKind = async (kind: string): Promise<AssetItem[]> => {
+  const response = await apiClient.get("/assets", {
+    params: { kind },
+  });
+  return response.data.items || [];
+};
+
+/** 创建素材（上传文件后调用，附带 metadata） */
+export const createAsset = async (data: {
+  library_id: string;
+  name: string;
+  storage_key: string;
+  mime_type: string;
+  metadata?: Record<string, unknown>;
+}): Promise<AssetItem> => {
+  const response = await apiClient.post("/assets", data);
+  return response.data;
+};
+
+/** 更新素材（名称、metadata 等） */
+export const updateAsset = async (
+  assetId: string,
+  data: { name?: string; metadata?: Record<string, unknown> },
+): Promise<AssetItem> => {
+  const response = await apiClient.put(`/assets/${assetId}`, data);
+  return response.data;
+};
+
 /** 更新素材审核状态 */
 export const updateAssetReviewStatus = async (
   assetId: string,