diff --git a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
index cdb385d..2229abf 100644
--- a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
+++ b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
@@ -145,8 +145,14 @@ namespace YD_AllHeartRates.Api.Services.Impl
         {
             var student = await _sportsContext.Student.Where(x => x.StudentNo == dto.StudentNo).FirstOrDefaultAsync();
 
-            if (student == null)
-                throw new Exception($"学号:{dto.StudentNo}的学生不存在!");
+            if (student != null)
+                throw new Exception($"学号:{dto.StudentNo}的学生已存在!");
+
+            var device = await _sportsContext.Device.Where(x => x.Code == dto.Code).FirstOrDefaultAsync();
+
+            if (device != null)
+                throw new Exception($"设备编号:{dto.Code}的学生已存在!");
+
 
             var entity = new S_Device()
             {
@@ -176,8 +182,8 @@ namespace YD_AllHeartRates.Api.Services.Impl
 
             var student = await _sportsContext.Student.Where(x => x.StudentNo == dto.StudentNo).FirstOrDefaultAsync();
 
-            if (student == null)
-                throw new Exception($"学号:{dto.StudentNo}的学生不存在!");
+            if (student != null)
+                throw new Exception($"学号:{dto.StudentNo}的学生已存在!");
 
             device.StudentNo = dto.StudentNo;
             device.DeviceType = dto.DeviceType;