diff --git a/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs b/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs
index 7afafed8..a2ee10d8 100644
--- a/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs
+++ b/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs
@@ -447,21 +447,64 @@ public class GainfoUpdateService : IGainfoUpdateService
 
     private async Task<List<SapPersonItem>> GetModifiedPersonAsync(List<SapPersonItem> sapList)
     {
-        var last = await LoadDataAsync();
+        if (sapList.Count <= 0)
+        {
+            return new List<SapPersonItem>();
+        }
+
+        var comparer = new SapPersonComparer();
+        var workCodes = sapList
+            .Select(x => x.ZWORKCODE)
+            .Where(x => !string.IsNullOrWhiteSpace(x))
+            .Distinct()
+            .ToList();
+
+        if (workCodes.Count <= 0)
+        {
+            return sapList;
+        }
+
+        var last = await LoadDataAsync(workCodes);
         if (last.Count <= 0)
         {
             return sapList;
         }
 
-        var comparer = new SapPersonComparer();
-        var needRemove = sapList.Intersect(last, comparer);
-        return sapList.Except(needRemove, comparer).ToList();
+        var lastMap = last
+            .Where(x => !string.IsNullOrWhiteSpace(x.ZWORKCODE))
+            .GroupBy(x => x.ZWORKCODE)
+            .ToDictionary(x => x.Key, x => x.First());
+
+        var modifiedPersons = new List<SapPersonItem>();
+        foreach (var person in sapList)
+        {
+            if (string.IsNullOrWhiteSpace(person.ZWORKCODE))
+            {
+                modifiedPersons.Add(person);
+                continue;
+            }
+
+            if (!lastMap.TryGetValue(person.ZWORKCODE, out var historyPerson) || !comparer.Equals(person, historyPerson))
+            {
+                modifiedPersons.Add(person);
+            }
+        }
+
+        return modifiedPersons;
     }
 
 
-    private async Task<List<SapPersonItem>> LoadDataAsync()
+    private async Task<List<SapPersonItem>> LoadDataAsync(List<string> workCodes)
     {
-        var gainfos = await _dbContext.Queryable<GainfoSapEntity>().ToListAsync();
+        var gainfos = new List<GainfoSapEntity>();
+        var chunks = workCodes.Chunk(2000);
+        foreach (var chunk in chunks)
+        {
+            var items = await _dbContext.Queryable<GainfoSapEntity>()
+                .Where(x => chunk.Contains(x.ename))
+                .ToListAsync();
+            gainfos.AddRange(items);
+        }
 
         return gainfos.Select(x => new SapPersonItem
         {