diff --git a/inventory-backend/app/models/base.py b/inventory-backend/app/models/base.py
index ab88f46..3ad07e8 100644
--- a/inventory-backend/app/models/base.py
+++ b/inventory-backend/app/models/base.py
@@ -32,14 +32,14 @@ class MaterialBase(db.Model):
     # 关联关系区域
     # ============================================================
 
-    # 1. 关联采购库存 (StockBuy)
-    stock_buys = db.relationship('StockBuy', back_populates='material', lazy='dynamic')
+    # 1. 关联采购库存 (StockBuy) - 修改 back_populates 为 'base'
+    stock_buys = db.relationship('StockBuy', back_populates='base', lazy='dynamic')
 
-    # 2. 关联半成品库存 (StockSemi)
-    stock_semis = db.relationship('StockSemi', back_populates='material', lazy='dynamic')
+    # 2. 关联半成品库存 (StockSemi) - 修改 back_populates 为 'base'
+    stock_semis = db.relationship('StockSemi', back_populates='base', lazy='dynamic')
 
-    # 3. 关联成品库存 (StockProduct)
-    stock_products = db.relationship('StockProduct', back_populates='material', lazy='dynamic')
+    # 3. 关联成品库存 (StockProduct) - 修改 back_populates 为 'base'
+    stock_products = db.relationship('StockProduct', back_populates='base', lazy='dynamic')
 
     def to_dict(self):
         """
diff --git a/inventory-backend/app/models/inbound/buy.py b/inventory-backend/app/models/inbound/buy.py
index cbbeb85..fa58ecd 100644
--- a/inventory-backend/app/models/inbound/buy.py
+++ b/inventory-backend/app/models/inbound/buy.py
@@ -1,5 +1,8 @@
+# inventory-backend/app/models/inbound/buy.py
 from app.extensions import db
 import json
+# 显式导入 MaterialBase 以防 relationship 找不到引用
+from app.models.base import MaterialBase
 
 class StockBuy(db.Model):
     """
@@ -48,9 +51,8 @@ class StockBuy(db.Model):
     # [新增] 全局打印流水号 (用于跨表连续编号，对应 Sequence: global_print_seq)
     global_print_id = db.Column(db.Integer)
 
-    # 关系定义
-    # 注意：这里使用字符串 'MaterialBase' 引用，避免了直接 import 导致的潜在循环依赖
-    material = db.relationship('MaterialBase', back_populates='stock_buys')
+    # 关系定义 [已修改]
+    base = db.relationship('MaterialBase', back_populates='stock_buys')
 
     def to_dict(self):
         # 辅助解析函数：将数据库存储的 JSON 字符串转为 List
@@ -68,11 +70,12 @@ class StockBuy(db.Model):
         return {
             'id': self.id,
             'base_id': self.base_id,
-            'material_name': self.material.name if self.material else '',
-            'spec_model': self.material.spec_model if self.material else '',
-            'category': self.material.category if self.material else '',
-            'unit': self.material.unit if self.material else '',
-            'material_type': self.material.material_type if self.material else '',
+            # [已修改] 使用 self.base
+            'material_name': self.base.name if self.base else '',
+            'spec_model': self.base.spec_model if self.base else '',
+            'category': self.base.category if self.base else '',
+            'unit': self.base.unit if self.base else '',
+            'material_type': self.base.material_type if self.base else '',
 
             'sku': self.sku,
             'inbound_date': self.in_date.strftime('%Y-%m-%d') if self.in_date else '',
diff --git a/inventory-backend/app/models/inbound/product.py b/inventory-backend/app/models/inbound/product.py
index 39ca826..7e55b03 100644
--- a/inventory-backend/app/models/inbound/product.py
+++ b/inventory-backend/app/models/inbound/product.py
@@ -1,7 +1,7 @@
 # app/models/inbound/product.py
 from app.extensions import db
 import json
-
+from app.models.base import MaterialBase
 
 class StockProduct(db.Model):
     """
@@ -57,8 +57,8 @@ class StockProduct(db.Model):
     # 全局打印流水号
     global_print_id = db.Column(db.Integer)
 
-    # 关系定义
-    material = db.relationship('MaterialBase', back_populates='stock_products')
+    # 关系定义 [已修改]
+    base = db.relationship('MaterialBase', back_populates='stock_products')
 
     def to_dict(self):
         raw_val = float(self.raw_material_cost or 0)
@@ -79,11 +79,12 @@ class StockProduct(db.Model):
         return {
             'id': self.id,
             'base_id': self.base_id,
-            'material_name': self.material.name if self.material else '',
-            'spec_model': self.material.spec_model if self.material else '',
-            'category': self.material.category if self.material else '',
-            'unit': self.material.unit if self.material else '',
-            'material_type': self.material.material_type if self.material else '',
+            # [已修改] 使用 self.base
+            'material_name': self.base.name if self.base else '',
+            'spec_model': self.base.spec_model if self.base else '',
+            'category': self.base.category if self.base else '',
+            'unit': self.base.unit if self.base else '',
+            'material_type': self.base.material_type if self.base else '',
 
             'sku': self.sku,
             'inbound_date': self.production_date.strftime('%Y-%m-%d') if self.production_date else '',
diff --git a/inventory-backend/app/models/inbound/semi.py b/inventory-backend/app/models/inbound/semi.py
index a47a2bd..7150e7b 100644
--- a/inventory-backend/app/models/inbound/semi.py
+++ b/inventory-backend/app/models/inbound/semi.py
@@ -1,7 +1,7 @@
 # app/models/inbound/semi.py
 from app.extensions import db
 import json
-
+from app.models.base import MaterialBase
 
 class StockSemi(db.Model):
     """
@@ -55,8 +55,8 @@ class StockSemi(db.Model):
     # [新增] 全局打印流水号
     global_print_id = db.Column(db.Integer)
 
-    # 关系定义
-    material = db.relationship('MaterialBase', back_populates='stock_semis')
+    # 关系定义 [已修改]
+    base = db.relationship('MaterialBase', back_populates='stock_semis')
 
     def to_dict(self):
         raw_val = float(self.raw_material_cost or 0)
@@ -78,11 +78,12 @@ class StockSemi(db.Model):
         return {
             'id': self.id,
             'base_id': self.base_id,
-            'material_name': self.material.name if self.material else '',
-            'spec_model': self.material.spec_model if self.material else '',
-            'category': self.material.category if self.material else '',
-            'unit': self.material.unit if self.material else '',
-            'material_type': self.material.material_type if self.material else '',
+            # [已修改] 使用 self.base
+            'material_name': self.base.name if self.base else '',
+            'spec_model': self.base.spec_model if self.base else '',
+            'category': self.base.category if self.base else '',
+            'unit': self.base.unit if self.base else '',
+            'material_type': self.base.material_type if self.base else '',
 
             'sku': self.sku,
             'inbound_date': self.production_date.strftime('%Y-%m-%d') if self.production_date else '',
diff --git a/inventory-backend/app/services/inbound/buy_service.py b/inventory-backend/app/services/inbound/buy_service.py
index 2f8f3ce..0ea65fa 100644
--- a/inventory-backend/app/services/inbound/buy_service.py
+++ b/inventory-backend/app/services/inbound/buy_service.py
@@ -37,8 +37,8 @@ class BuyInboundService:
 
             exists = query.first()
             if exists:
-                # 获取占用该SN的物料名称，提示更友好
-                occupied_name = exists.material.name if exists.material else "未知物料"
+                # [修改] 获取占用该SN的物料名称 (material -> base)
+                occupied_name = exists.base.name if exists.base else "未知物料"
                 raise ValueError(f"序列号【{serial_number}】已存在！被物料 [{occupied_name}] 占用，请核查。")
 
         # 2. 批号 (BN) 同物料唯一校验
@@ -309,12 +309,12 @@ class BuyInboundService:
                 d = {
                     'id': item.id,
                     'base_id': item.base_id,
-                    # 确保这里从关联的 MaterialBase 获取规格型号
-                    'material_name': item.material.name if item.material else '',
-                    'spec_model': item.material.spec_model if item.material else '',
-                    'category': item.material.category if item.material else '',
-                    'unit': item.material.unit if item.material else '',
-                    'material_type': item.material.material_type if item.material else '',
+                    # [核心修改] 确保这里从关联的 .base 获取信息
+                    'material_name': item.base.name if item.base else '',
+                    'spec_model': item.base.spec_model if item.base else '',
+                    'category': item.base.category if item.base else '',
+                    'unit': item.base.unit if item.base else '',
+                    'material_type': item.base.material_type if item.base else '',
 
                     'sku': item.sku,
                     'inbound_date': date_display,
diff --git a/inventory-backend/app/services/inbound/product_service.py b/inventory-backend/app/services/inbound/product_service.py
index 6677fd6..54b4e76 100644
--- a/inventory-backend/app/services/inbound/product_service.py
+++ b/inventory-backend/app/services/inbound/product_service.py
@@ -30,7 +30,8 @@ class ProductInboundService:
 
             exists = query.first()
             if exists:
-                occupied_name = exists.material.name if (hasattr(exists, 'material') and exists.material) else "未知物料"
+                # [修改] material -> base
+                occupied_name = exists.base.name if (hasattr(exists, 'base') and exists.base) else "未知物料"
                 raise ValueError(f"序列号【{serial_number}】已存在！被成品 [{occupied_name}] 占用，请核查。")
 
     # ============================================================
@@ -318,6 +319,7 @@ class ProductInboundService:
 
             items = []
             for item in current_items:
+                # [注意] 因为Model层已经修改了 to_dict 内部的 material -> base，所以这里直接调 to_dict 即可
                 d = item.to_dict()
 
                 # 格式化日期
diff --git a/inventory-backend/app/services/inbound/semi_service.py b/inventory-backend/app/services/inbound/semi_service.py
index 734a357..00e2fdb 100644
--- a/inventory-backend/app/services/inbound/semi_service.py
+++ b/inventory-backend/app/services/inbound/semi_service.py
@@ -32,7 +32,8 @@ class SemiInboundService:
 
             exists = query.first()
             if exists:
-                occupied_name = exists.material.name if (hasattr(exists, 'material') and exists.material) else "未知物料"
+                # [修改] material -> base
+                occupied_name = exists.base.name if (hasattr(exists, 'base') and exists.base) else "未知物料"
                 raise ValueError(f"序列号【{serial_number}】已存在！被半成品 [{occupied_name}] 占用，请核查。")
 
         # 2. 批号 (BN) 校验 - 同物料下不能重复开单
@@ -420,6 +421,7 @@ class SemiInboundService:
 
             items = []
             for item in current_items:
+                # [注意] 因为Model层已经修改了 to_dict 内部的 material -> base，所以这里直接调 to_dict 即可
                 d = item.to_dict()
 
                 # 格式化展示日期