diff --git a/backend/futures_trade_record/sql/04_create_variety_table.sql b/backend/futures_trade_record/sql/04_create_variety_table.sql
index e6696c4..074e13f 100644
--- a/backend/futures_trade_record/sql/04_create_variety_table.sql
+++ b/backend/futures_trade_record/sql/04_create_variety_table.sql
@@ -3,6 +3,7 @@
 
 DO $$
 BEGIN
+    -- 创建主表 variety
     IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'variety') THEN
         CREATE TABLE variety ( 
             id UUID DEFAULT gen_random_uuid_v7() PRIMARY KEY NOT NULL,
@@ -20,6 +21,7 @@ BEGIN
         RAISE NOTICE 'variety table already exists';
     END IF;
 
+    -- 创建子表 variety_name 并添加外键
     IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'variety_name') THEN
         CREATE TABLE variety_name ( 
             id UUID DEFAULT gen_random_uuid_v7() PRIMARY KEY NOT NULL,
@@ -27,18 +29,25 @@ BEGIN
             name VARCHAR(50) NOT NULL,
             deleted BOOLEAN NOT NULL DEFAULT FALSE,
             created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
+            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            -- 外键约束，关联variety主表
+            CONSTRAINT fk_variety_name_variety
+                FOREIGN KEY (variety_id)
+                REFERENCES variety(id)
+                ON DELETE CASCADE  -- 主表记录删除时，子表关联记录也删除
+                ON UPDATE CASCADE  -- 主表id更新时，子表关联id同步更新
         );
         CREATE TRIGGER update_variety_name_updated_at
         BEFORE UPDATE ON "variety_name"
         FOR EACH ROW
         EXECUTE FUNCTION update_data_modified_column();
         
-        RAISE NOTICE 'created variety_name table and trigger';
+        RAISE NOTICE 'created variety_name table, trigger and foreign key';
     ELSE
         RAISE NOTICE 'variety_name table already exists';
     END IF;
 
+    -- 创建子表 variety_code 并添加外键
     IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'variety_code') THEN
         CREATE TABLE variety_code ( 
             id UUID DEFAULT gen_random_uuid_v7() PRIMARY KEY NOT NULL,
@@ -46,18 +55,25 @@ BEGIN
             code VARCHAR(50) NOT NULL,
             deleted BOOLEAN NOT NULL DEFAULT FALSE,
             created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
+            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            -- 外键约束，关联variety主表
+            CONSTRAINT fk_variety_code_variety
+                FOREIGN KEY (variety_id)
+                REFERENCES variety(id)
+                ON DELETE CASCADE
+                ON UPDATE CASCADE
         );
         CREATE TRIGGER update_variety_code_updated_at
         BEFORE UPDATE ON "variety_code"
         FOR EACH ROW
         EXECUTE FUNCTION update_data_modified_column();
         
-        RAISE NOTICE 'created variety_code table and trigger';
+        RAISE NOTICE 'created variety_code table, trigger and foreign key';
     ELSE
         RAISE NOTICE 'variety_code table already exists';
     END IF;
 
+    -- 创建子表 variety_tick 并添加外键
     IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'variety_tick') THEN
         CREATE TABLE variety_tick ( 
             id UUID DEFAULT gen_random_uuid_v7() PRIMARY KEY NOT NULL,
@@ -65,18 +81,25 @@ BEGIN
             tick NUMERIC(12, 6),
             deleted BOOLEAN NOT NULL DEFAULT FALSE,
             created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
+            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            -- 外键约束，关联variety主表
+            CONSTRAINT fk_variety_tick_variety
+                FOREIGN KEY (variety_id)
+                REFERENCES variety(id)
+                ON DELETE CASCADE
+                ON UPDATE CASCADE
         );
         CREATE TRIGGER update_variety_tick_updated_at
         BEFORE UPDATE ON "variety_tick"
         FOR EACH ROW
         EXECUTE FUNCTION update_data_modified_column();
         
-        RAISE NOTICE 'created variety_tick table and trigger';
+        RAISE NOTICE 'created variety_tick table, trigger and foreign key';
     ELSE
         RAISE NOTICE 'variety_tick table already exists';
     END IF;
 
+    -- 创建子表 variety_tick_price 并添加外键
     IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'variety_tick_price') THEN
         CREATE TABLE variety_tick_price ( 
             id UUID DEFAULT gen_random_uuid_v7() PRIMARY KEY NOT NULL,
@@ -84,14 +107,20 @@ BEGIN
             price NUMERIC(12, 6),
             deleted BOOLEAN NOT NULL DEFAULT FALSE,
             created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
+            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            -- 外键约束，关联variety主表
+            CONSTRAINT fk_variety_tick_price_variety
+                FOREIGN KEY (variety_id)
+                REFERENCES variety(id)
+                ON DELETE CASCADE
+                ON UPDATE CASCADE
         );
         CREATE TRIGGER update_variety_tick_price_updated_at
         BEFORE UPDATE ON "variety_tick_price"
         FOR EACH ROW
         EXECUTE FUNCTION update_data_modified_column();
         
-        RAISE NOTICE 'created variety_tick_price table and trigger';
+        RAISE NOTICE 'created variety_tick_price table, trigger and foreign key';
     ELSE
         RAISE NOTICE 'variety_tick_price table already exists';
     END IF;