diff --git a/backend/app/service/BusinessTripService.php b/backend/app/service/BusinessTripService.php
index 84ee226..19e8229 100644
--- a/backend/app/service/BusinessTripService.php
+++ b/backend/app/service/BusinessTripService.php
@@ -269,10 +269,102 @@ class BusinessTripService
                 }
             }
 
+            // 发送飞书通知给审批人
+            $this->sendApprovalNotification($businessTrip, $approverIds, $ccUserIds);
+
             return $businessTrip->fresh(['itineraries', 'approvalOrder']);
         });
     }
 
+    /**
+     * 发送审批通知（飞书消息）
+     */
+    private function sendApprovalNotification(BusinessTrip $businessTrip, array $approverIds, array $ccUserIds): void
+    {
+        try {
+            $notificationService = new \app\service\FeishuNotificationService();
+
+            // 构建详情链接
+            $detailUrl = "https://xsm.dev.hnxinyouhe.com/business-trip/detail/{$businessTrip->id}";
+
+            // 构建内容
+            $content = "**出差原因**: {$businessTrip->reason}\n";
+            $content .= "**目的地**: {$businessTrip->destination}\n";
+            $content .= "**时间**: {$businessTrip->start_date} 至 {$businessTrip->end_date}";
+
+            // 通知审批人
+            foreach ($approverIds as $approverId) {
+                try {
+                    $notificationService->setAppByUser($approverId)
+                        ->sendApprovalNotification([
+                            'user_id' => $approverId,
+                            'title' => '新的出差审批申请',
+                            'applicant' => $businessTrip->user->name,
+                            'type' => '出差申请',
+                            'content' => $content,
+                            'url' => $detailUrl,
+                        ]);
+                } catch (\Exception $e) {
+                    error_log("发送审批通知失败: approver_id={$approverId}, error=" . $e->getMessage());
+                }
+            }
+
+            // 通知抄送人
+            foreach ($ccUserIds as $ccUserId) {
+                try {
+                    $notificationService->setAppByUser($ccUserId)
+                        ->sendSystemNotification([
+                            'user_ids' => [$ccUserId],
+                            'title' => '出差申请抄送',
+                            'content' => "**申请人**: {$businessTrip->user->name}\n" . $content,
+                            'url' => $detailUrl,
+                        ]);
+                } catch (\Exception $e) {
+                    error_log("发送抄送通知失败: cc_user_id={$ccUserId}, error=" . $e->getMessage());
+                }
+            }
+        } catch (\Exception $e) {
+            error_log("发送飞书通知异常: " . $e->getMessage());
+        }
+    }
+
+    /**
+     * 发送审批结果通知（飞书消息）
+     */
+    private function sendApprovalResultNotification(BusinessTrip $businessTrip, string $action, string $comment = ''): void
+    {
+        try {
+            $notificationService = new \app\service\FeishuNotificationService();
+            $detailUrl = "https://xsm.dev.hnxinyouhe.com/business-trip/detail/{$businessTrip->id}";
+
+            if ($action === 'approve') {
+                $title = '出差申请已通过';
+                $content = "您的出差申请已通过审批。\n";
+                $content .= "**申请原因**: {$businessTrip->reason}\n";
+                if ($comment) {
+                    $content .= "**审批意见**: {$comment}";
+                }
+            } else {
+                $title = '出差申请已拒绝';
+                $content = "您的出差申请被拒绝。\n";
+                $content .= "**申请原因**: {$businessTrip->reason}\n";
+                if ($comment) {
+                    $content .= "**拒绝原因**: {$comment}";
+                }
+            }
+
+            $notificationService->setAppByUser($businessTrip->user_id)
+                ->sendSystemNotification([
+                    'user_ids' => [$businessTrip->user_id],
+                    'title' => $title,
+                    'content' => $content,
+                    'url' => $detailUrl,
+                ]);
+        } catch (\Exception $e) {
+            error_log("发送审批结果通知失败: " . $e->getMessage());
+        }
+    }
+
     /**
      * 获取出差申请列表
      */
@@ -463,12 +555,57 @@ class BusinessTripService
                 $approvalOrder->status = ApprovalOrder::STATUS_CANCELLED;
                 $approvalOrder->current_nodes = [];
                 $approvalOrder->save();
+
+                // 发送取消通知给审批人和抄送人
+                $this->sendCancelNotification($businessTrip, $approvalOrder);
             }
         }
 
         return $businessTrip->fresh();
     }
 
+    /**
+     * 发送取消通知（飞书消息）
+     */
+    private function sendCancelNotification(BusinessTrip $businessTrip, ApprovalOrder $approvalOrder): void
+    {
+        try {
+            $notificationService = new \app\service\FeishuNotificationService();
+            $detailUrl = "https://xsm.dev.hnxinyouhe.com/business-trip/detail/{$businessTrip->id}";
+
+            // 获取审批人和抄送人
+            $formData = $approvalOrder->form_data ?? [];
+            $approvers = $formData['approvers'] ?? [];
+            $ccUsers = $formData['cc_users'] ?? [];
+
+            $content = "**申请人**: {$businessTrip->user->name}\n";
+            $content .= "**出差原因**: {$businessTrip->reason}\n";
+            $content .= "**目的地**: {$businessTrip->destination}";
+
+            // 合并所有需要通知的用户ID
+            $allUserIds = array_unique(array_merge(
+                array_column($approvers, 'id'),
+                array_column($ccUsers, 'id')
+            ));
+
+            foreach ($allUserIds as $notifyUserId) {
+                try {
+                    $notificationService->setAppByUser($notifyUserId)
+                        ->sendSystemNotification([
+                            'user_ids' => [$notifyUserId],
+                            'title' => '出差申请已取消',
+                            'content' => $content,
+                            'url' => $detailUrl,
+                        ]);
+                } catch (\Exception $e) {
+                    error_log("发送取消通知失败: user_id={$notifyUserId}, error=" . $e->getMessage());
+                }
+            }
+        } catch (\Exception $e) {
+            error_log("发送取消通知异常: " . $e->getMessage());
+        }
+    }
+
     /**
      * 删除草稿
      */
@@ -572,6 +709,9 @@ class BusinessTripService
             $approvalOrder->save();
             $businessTrip->save();
 
+            // 发送审批结果通知
+            $this->sendApprovalResultNotification($businessTrip, $action, $comment);
+
             return $businessTrip->fresh(['itineraries', 'approvalOrder']);
         });
     }