diff --git a/backend/migrations/20250301_create_business_trip_itinerary_table.php b/backend/migrations/20250301_create_business_trip_itinerary_table.php
new file mode 100644
index 0000000..0d04f3c
--- /dev/null
+++ b/backend/migrations/20250301_create_business_trip_itinerary_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use support\Db;
+
+return new class
+{
+    public function up(): void
+    {
+        Db::statement('
+            CREATE TABLE IF NOT EXISTS `business_trip_itinerary` (
+                `id` bigint unsigned NOT NULL AUTO_INCREMENT COMMENT \'行程ID\',
+                `business_trip_id` bigint unsigned NOT NULL COMMENT \'出差申请ID\',
+                `start_time` datetime NOT NULL COMMENT \'开始时间\',
+                `end_time` datetime DEFAULT NULL COMMENT \'结束时间\',
+                `departure` varchar(100) DEFAULT NULL COMMENT \'出发地\',
+                `destination` varchar(100) NOT NULL COMMENT \'目的地\',
+                `transport` varchar(50) DEFAULT NULL COMMENT \'交通方式\',
+                `trip_type` varchar(20) DEFAULT \'oneway\' COMMENT \'行程类型 oneway/roundtrip\',
+                `remark` varchar(255) DEFAULT NULL COMMENT \'备注\',
+                `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT \'创建时间\',
+                `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT \'更新时间\',
+                PRIMARY KEY (`id`),
+                KEY `idx_business_trip_id` (`business_trip_id`),
+                KEY `idx_date` (`start_time`)
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT=\'出差行程明细表\'
+        ');
+    }
+
+    public function down(): void
+    {
+        Db::statement('DROP TABLE IF EXISTS `business_trip_itinerary`');
+    }
+};