diff --git a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
index 2229abf..a3317fb 100644
--- a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
+++ b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
@@ -143,10 +143,13 @@ namespace YD_AllHeartRates.Api.Services.Impl
         /// <returns></returns>
         public async Task<bool> AddDevice([FromBody] AddDeviceDto dto)
         {
-            var student = await _sportsContext.Student.Where(x => x.StudentNo == dto.StudentNo).FirstOrDefaultAsync();
+            if (!string.IsNullOrWhiteSpace(dto.StudentNo))
+            {
+                var student = await _sportsContext.Student.Where(x => x.StudentNo == dto.StudentNo).FirstOrDefaultAsync();
 
-            if (student != null)
-                throw new Exception($"学号:{dto.StudentNo}的学生已存在!");
+                if (student != null)
+                    throw new Exception($"学号:{dto.StudentNo}的学生已存在!");
+            }
 
             var device = await _sportsContext.Device.Where(x => x.Code == dto.Code).FirstOrDefaultAsync();
 
@@ -180,10 +183,13 @@ namespace YD_AllHeartRates.Api.Services.Impl
             if (device == null)
                 throw new Exception("更新的设备不存在");
 
-            var student = await _sportsContext.Student.Where(x => x.StudentNo == dto.StudentNo).FirstOrDefaultAsync();
+            if (!string.IsNullOrWhiteSpace(dto.StudentNo))
+            {
+                var student = await _sportsContext.Student.Where(x => x.StudentNo == dto.StudentNo).FirstOrDefaultAsync();
 
-            if (student != null)
-                throw new Exception($"学号:{dto.StudentNo}的学生已存在!");
+                if (student != null)
+                    throw new Exception($"学号:{dto.StudentNo}的学生已存在!");
+            }
 
             device.StudentNo = dto.StudentNo;
             device.DeviceType = dto.DeviceType;