diff --git a/HJGL_DS/BLL/API/APIWeldServices.cs b/HJGL_DS/BLL/API/APIWeldServices.cs
index c5cbb9b..e0439df 100644
--- a/HJGL_DS/BLL/API/APIWeldServices.cs
+++ b/HJGL_DS/BLL/API/APIWeldServices.cs
@@ -417,10 +417,10 @@ namespace BLL.API
                 {
                       dateTime = DateTime.Parse(date); 
                 }
-                var q = from pw in db.Project_Welder
+                var q = (from pw in db.Project_Welder
                         join w in db.HJGL_BS_Welder on pw.WED_ID equals w.WED_ID 
                         where w.PhotoUrl !=null && pw.ExchangeTime > dateTime
-                        select w;
+                        select w).Distinct();
              
                 List<WelderItem> res = new List<WelderItem>();
                 foreach (var p in q)
@@ -465,6 +465,7 @@ namespace BLL.API
                     item.AttachUrl = p.AttachUrl;
                     item.PhotoUrl = p.PhotoUrl;
                     item.IsFaceTrain = p.IsFaceTrain;
+                    item.ExchangeTime = DateTime.Now;
                     res.Add(item); 
                 } 
                 respone.data = res; 
diff --git a/HJGL_DS/Model/APIItem/WelderItem.cs b/HJGL_DS/Model/APIItem/WelderItem.cs
index 8c4017d..335d92a 100644
--- a/HJGL_DS/Model/APIItem/WelderItem.cs
+++ b/HJGL_DS/Model/APIItem/WelderItem.cs
@@ -244,7 +244,7 @@ namespace Model.APIItem
 		public DateTime? LimitDate { get; set; }
 
 
-
+        public DateTime? ExchangeTime { get; set; }
 		public string IdentityCard { get; set; }
 
 
@@ -254,5 +254,6 @@ namespace Model.APIItem
 
 
         public bool? IsFaceTrain { get; set; }
-	}
+    
+    }
 }