diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
index 4e30ea8d0..4bd79f267 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
@@ -116,7 +116,7 @@ namespace IRaCIS.Core.Application.Service
                     generateUser.Code = _userRepository.Select(t => t.Code).DefaultIfEmpty().Max() + 1;
 
 
-                    generateUser.UserCode = AppSettings.GetCodeStr(generateUser.Code, nameof(User)); 
+                    generateUser.UserCode = AppSettings.GetCodeStr(generateUser.Code, nameof(User));
 
                     generateUser.UserName = generateUser.UserCode;
 
@@ -165,7 +165,7 @@ namespace IRaCIS.Core.Application.Service
             else
             {
                 return ResponseOutput.NotOk("人员信息不支持编辑，请删除后重新添加。");
-            
+
             }
         }
 
@@ -176,6 +176,14 @@ namespace IRaCIS.Core.Application.Service
         [Authorize(Policy = IRaCISPolicy.PM_APM)]
         public async Task<IResponseOutput> DeleteTrialExternalUser(Guid trialExternalUserId, bool isSystemUser, Guid systemUserId)
         {
+            var trialExternalUser = await _trialExternalUseRepository.FirstOrDefaultAsync(t => t.Id == trialExternalUserId);
+
+            if (await _trialUserRepository.AnyAsync(t => t.TrialId == trialExternalUser.TrialId && t.Id == trialExternalUser.SystemUserId))
+            {
+                return ResponseOutput.NotOk("当前用户已参与到项目，不允许删除");
+            }
+
+
             var success = await _trialExternalUseRepository.BatchDeleteNoTrackingAsync(t => t.Id == trialExternalUserId);
 
             if (isSystemUser == false)
@@ -200,7 +208,7 @@ namespace IRaCIS.Core.Application.Service
                 var userId = userInfo.SystemUserId;
 
                 await _mailVerificationService.ExternalUserJoinEmail(trialId, userId, sendEmail.BaseUrl, sendEmail.RouteUrl);
-           
+
 
                 //判断TrialUser中是否存在  不存在就插入  注意退出了，也不能再加进来
                 if (!await _trialUserRepository.AnyAsync(t => t.TrialId == trialId && t.UserId == userId, true))