diff --git a/inventory-backend/app/api/v1/purchase.py b/inventory-backend/app/api/v1/purchase.py
index fe16b69..a1b7146 100644
--- a/inventory-backend/app/api/v1/purchase.py
+++ b/inventory-backend/app/api/v1/purchase.py
@@ -65,7 +65,13 @@ def get_purchase_list():
         page = int(request.args.get('page', 1))
         per_page = int(request.args.get('limit', 20))
         status = request.args.get('status')
-        status = int(status) if status is not None else None
+        status = int(status) if status not in (None, '', 'all') else None
+
+        # 搜索参数（与出库/报废记录同一套语义，便于用户迁移习惯）
+        keyword = (request.args.get('keyword') or '').strip()
+        search_type = (request.args.get('search_type') or 'all').strip()
+        start_date = (request.args.get('start_date') or '').strip()
+        end_date = (request.args.get('end_date') or '').strip()
 
         user_id = get_current_user_id()
         can_view_all = _user_has_purchase_perm()
@@ -74,7 +80,11 @@ def get_purchase_list():
             page=page,
             per_page=per_page,
             requester_id=None if can_view_all else user_id,
-            status=status
+            status=status,
+            keyword=keyword,
+            search_type=search_type,
+            start_date=start_date,
+            end_date=end_date,
         )
 
         # ★ 字段级价格过滤
diff --git a/inventory-backend/app/services/purchase_service.py b/inventory-backend/app/services/purchase_service.py
index bcf2372..8cf8be7 100644
--- a/inventory-backend/app/services/purchase_service.py
+++ b/inventory-backend/app/services/purchase_service.py
@@ -180,11 +180,20 @@ class PurchaseService:
         return purchase
 
     @staticmethod
-    def get_purchase_list(page=1, per_page=20, requester_id=None, status=None):
-        """获取采购申请列表，普通用户只看自己的，主管/超管看同公司全部"""
+    def get_purchase_list(page=1, per_page=20, requester_id=None, status=None,
+                          keyword=None, search_type='all',
+                          start_date=None, end_date=None):
+        """
+        获取采购申请列表，普通用户只看自己的，主管/超管看同公司全部。
+
+        搜索参数（与出库/报废记录保持同一套语义，便于用户迁移习惯）：
+          keyword    关键词
+          search_type all / no(单号) / name(物料名称) / spec_model / requester(申请人)
+          start_date / end_date  按采购日期过滤（含边界）
+        """
         from app.utils.decorators import get_current_company_filter
         from app.models.system import SysUser
-        from sqlalchemy import or_
+        from sqlalchemy import or_, cast, String
 
         query = PurchaseRequest.query
 
@@ -194,15 +203,57 @@ class PurchaseService:
         if status is not None:
             query = query.filter(PurchaseRequest.status == status)
 
+        # ---- 关键词搜索 ----
+        #
+        # 申请人姓名存在 SysUser.username，格式为「姓名/账号」（如 韩善龙/hanshanlong），
+        # 因此按「姓名」搜索时用 ilike 直接匹配整串即可命中。
+        # 该类字段只存在于 SysUser，故需要 join；单号/名称/规格则不需要 ——
+        # 只在必要时 join，避免无谓的联表。
+        needs_user = bool(keyword) and search_type in ('requester', 'all')
+        if needs_user:
+            query = query.outerjoin(SysUser, PurchaseRequest.requester_id == SysUser.id)
+
+        if keyword:
+            kw = f'%{keyword}%'
+            if search_type == 'no':
+                query = query.filter(PurchaseRequest.request_no.ilike(kw))
+            elif search_type == 'name':
+                query = query.filter(PurchaseRequest.name.ilike(kw))
+            elif search_type == 'spec_model':
+                query = query.filter(PurchaseRequest.spec_model.ilike(kw))
+            elif search_type == 'requester':
+                query = query.filter(SysUser.username.ilike(kw))
+            else:  # all —— 覆盖单号 / 名称 / 规格 / 备注 / 申请人
+                query = query.filter(or_(
+                    PurchaseRequest.request_no.ilike(kw),
+                    PurchaseRequest.name.ilike(kw),
+                    PurchaseRequest.spec_model.ilike(kw),
+                    PurchaseRequest.remark.ilike(kw),
+                    SysUser.username.ilike(kw),
+                ))
+
+        # ---- 日期范围（按采购日期）----
+        if start_date:
+            query = query.filter(PurchaseRequest.purchase_date >= start_date)
+        if end_date:
+            query = query.filter(PurchaseRequest.purchase_date <= end_date)
+
         # 【行级数据隔离】同公司可见：匹配 MaterialBase.company_name 或 SysUser.department
         company_limit = get_current_company_filter()
         if company_limit is not None:
-            query = query.outerjoin(MaterialBase, PurchaseRequest.base_id == MaterialBase.id) \
-                         .outerjoin(SysUser, PurchaseRequest.requester_id == SysUser.id) \
-                         .filter(or_(
-                             MaterialBase.company_name == company_limit,
-                             SysUser.department == company_limit
-                         ))
+            query = query.outerjoin(MaterialBase, PurchaseRequest.base_id == MaterialBase.id)
+            # SysUser 可能已被上面的关键词分支 join 过 —— 重复 join 会产生
+            # 笛卡尔积导致结果翻倍，此处按需补 join。
+            if not needs_user:
+                query = query.outerjoin(SysUser, PurchaseRequest.requester_id == SysUser.id)
+            query = query.filter(or_(
+                MaterialBase.company_name == company_limit,
+                SysUser.department == company_limit
+            ))
+
+        # ★ 兜底去重：上述 join 在特定组合下（如 base_id 为空 + requester 匹配）
+        #   仍可能产生重复行，用 distinct 保证每个单据只出现一次。
+        query = query.distinct()
 
         query = query.order_by(PurchaseRequest.created_at.desc())
         pagination = query.paginate(page=page, per_page=per_page, error_out=False)