diff --git a/src/backend/sql/triggers/01301_order_item_audit_insert.sql b/src/backend/sql/triggers/01301_order_item_audit_insert.sql
new file mode 100644
index 0000000..794f28d
--- /dev/null
+++ b/src/backend/sql/triggers/01301_order_item_audit_insert.sql
@@ -0,0 +1,34 @@
+-- -----------------------------------------------------
+-- Trigger for AFTER INSERT on OrderItem table
+-- -----------------------------------------------------
+CREATE TRIGGER `trg_OrderItem_Audit_Insert`
+    AFTER INSERT ON `OrderItem`
+    FOR EACH ROW
+BEGIN
+    INSERT INTO `AuditLog` (
+        `TableName`,
+        `RowPKValue`,
+        `OperationType`,
+        `ChangedByUserID`,
+        `OldValues_JSON`,
+        `NewValues_JSON`
+    )
+    VALUES (
+               'OrderItem',
+               CAST(NEW.OrderItemID AS CHAR), -- 主键值
+               'INSERT',
+               @actor_id, -- 从会话变量获取操作者ID
+               NULL,       -- INSERT 操作没有旧值
+               JSON_OBJECT(
+                       'OrderItemID', NEW.OrderItemID,
+                       'OrderID', NEW.OrderID,
+                       'ProductID', NEW.ProductID,
+                       'StoreID', NEW.StoreID,
+                       'Quantity', NEW.Quantity,
+                       'PriceAtPurchase', NEW.PriceAtPurchase,
+                       'ProductNameAtPurchase', NEW.ProductNameAtPurchase,
+                       'ProductImageURLAtPurchase', NEW.ProductImageURLAtPurchase,
+                       'Subtotal', NEW.Subtotal
+               )
+           );
+END;
diff --git a/src/backend/sql/triggers/01302_order_item_audit_update.sql b/src/backend/sql/triggers/01302_order_item_audit_update.sql
new file mode 100644
index 0000000..2f30ebd
--- /dev/null
+++ b/src/backend/sql/triggers/01302_order_item_audit_update.sql
@@ -0,0 +1,55 @@
+-- -----------------------------------------------------
+-- Trigger for AFTER UPDATE on OrderItem table
+-- -----------------------------------------------------
+CREATE TRIGGER `trg_OrderItem_Audit_Update`
+    AFTER UPDATE ON `OrderItem`
+    FOR EACH ROW
+BEGIN
+    -- 只有当受监控的业务字段实际发生变化时才记录日志
+    IF OLD.OrderID <=> NEW.OrderID OR
+       OLD.ProductID <=> NEW.ProductID OR
+       OLD.StoreID <=> NEW.StoreID OR
+       OLD.Quantity <=> NEW.Quantity OR
+       OLD.PriceAtPurchase <=> NEW.PriceAtPurchase OR
+       OLD.ProductNameAtPurchase <=> NEW.ProductNameAtPurchase OR
+       OLD.ProductImageURLAtPurchase <=> NEW.ProductImageURLAtPurchase OR
+       OLD.Subtotal <=> NEW.Subtotal
+    THEN
+        INSERT INTO `AuditLog` (
+            `TableName`,
+            `RowPKValue`,
+            `OperationType`,
+            `ChangedByUserID`,
+            `OldValues_JSON`,
+            `NewValues_JSON`
+        )
+        VALUES (
+                   'OrderItem',
+                   CAST(NEW.OrderItemID AS CHAR), -- 主键值
+                   'UPDATE',
+                   @actor_id,
+                   JSON_OBJECT(
+                           'OrderItemID', OLD.OrderItemID,
+                           'OrderID', OLD.OrderID,
+                           'ProductID', OLD.ProductID,
+                           'StoreID', OLD.StoreID,
+                           'Quantity', OLD.Quantity,
+                           'PriceAtPurchase', OLD.PriceAtPurchase,
+                           'ProductNameAtPurchase', OLD.ProductNameAtPurchase,
+                           'ProductImageURLAtPurchase', OLD.ProductImageURLAtPurchase,
+                           'Subtotal', OLD.Subtotal
+                   ),
+                   JSON_OBJECT(
+                           'OrderItemID', NEW.OrderItemID,
+                           'OrderID', NEW.OrderID,
+                           'ProductID', NEW.ProductID,
+                           'StoreID', NEW.StoreID,
+                           'Quantity', NEW.Quantity,
+                           'PriceAtPurchase', NEW.PriceAtPurchase,
+                           'ProductNameAtPurchase', NEW.ProductNameAtPurchase,
+                           'ProductImageURLAtPurchase', NEW.ProductImageURLAtPurchase,
+                           'Subtotal', NEW.Subtotal
+                   )
+               );
+    END IF;
+END;
diff --git a/src/backend/sql/triggers/01303_order_item_audit_delete.sql b/src/backend/sql/triggers/01303_order_item_audit_delete.sql
new file mode 100644
index 0000000..3de0441
--- /dev/null
+++ b/src/backend/sql/triggers/01303_order_item_audit_delete.sql
@@ -0,0 +1,34 @@
+-- -----------------------------------------------------
+-- Trigger for AFTER DELETE on OrderItem table
+-- -----------------------------------------------------
+CREATE TRIGGER `trg_OrderItem_Audit_Delete`
+    AFTER DELETE ON `OrderItem`
+    FOR EACH ROW
+BEGIN
+    INSERT INTO `AuditLog` (
+        `TableName`,
+        `RowPKValue`,
+        `OperationType`,
+        `ChangedByUserID`,
+        `OldValues_JSON`,
+        `NewValues_JSON`
+    )
+    VALUES (
+               'OrderItem',
+               CAST(OLD.OrderItemID AS CHAR),
+               'DELETE',
+               @actor_id,
+               JSON_OBJECT(
+                       'OrderItemID', OLD.OrderItemID,
+                       'OrderID', OLD.OrderID,
+                       'ProductID', OLD.ProductID,
+                       'StoreID', OLD.StoreID,
+                       'Quantity', OLD.Quantity,
+                       'PriceAtPurchase', OLD.PriceAtPurchase,
+                       'ProductNameAtPurchase', OLD.ProductNameAtPurchase,
+                       'ProductImageURLAtPurchase', OLD.ProductImageURLAtPurchase,
+                       'Subtotal', OLD.Subtotal
+               ),
+               NULL -- DELETE 操作没有新值
+           );
+END;