diff --git a/backend/app/service/BusinessTripService.php b/backend/app/service/BusinessTripService.php
index fa4fd42..203f6d5 100644
--- a/backend/app/service/BusinessTripService.php
+++ b/backend/app/service/BusinessTripService.php
@@ -67,10 +67,14 @@ class BusinessTripService
 
                 // 创建行程明细
                 foreach ($itineraries as $itinerary) {
+                    // 处理空字符串和空值
+                    $startTime = !empty($itinerary['start_time']) ? $itinerary['start_time'] : null;
+                    $endTime = !empty($itinerary['end_time']) ? $itinerary['end_time'] : null;
+
                     BusinessTripItinerary::create([
                         'business_trip_id' => $businessTrip->id,
-                        'start_time' => $itinerary['start_time'],
-                        'end_time' => $itinerary['end_time'] ?? null,
+                        'start_time' => $startTime,
+                        'end_time' => $endTime,
                         'departure' => $itinerary['departure'] ?? '',
                         'destination' => $itinerary['destination'] ?? '',
                         'transport' => $itinerary['transport'] ?? '',
@@ -585,10 +589,14 @@ class BusinessTripService
                 $destinations = [];
 
                 foreach ($data['itineraries'] as $itinerary) {
+                    // 处理空字符串和空值
+                    $startTime = !empty($itinerary['start_time']) ? $itinerary['start_time'] : null;
+                    $endTime = !empty($itinerary['end_time']) ? $itinerary['end_time'] : null;
+
                     BusinessTripItinerary::create([
                         'business_trip_id' => $businessTrip->id,
-                        'start_time' => $itinerary['start_time'],
-                        'end_time' => $itinerary['end_time'] ?? null,
+                        'start_time' => $startTime,
+                        'end_time' => $endTime,
                         'departure' => $itinerary['departure'] ?? '',
                         'destination' => $itinerary['destination'] ?? '',
                         'transport' => $itinerary['transport'] ?? '',