diff --git a/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs b/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs
index ff54b58d..9cef8d54 100644
--- a/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs
+++ b/Src/Dlhis.Basic/Organization/Services/Implements/GainfoUpdateService.cs
@@ -504,6 +504,18 @@ public class GainfoUpdateService : IGainfoUpdateService
             }
         }
 
+        if (modifiedPersons.Count > 0)
+        {
+            var first = modifiedPersons[0];
+            SapPersonItem historyPerson = null;
+            var hasHistory = !string.IsNullOrWhiteSpace(first.ZWORKCODE) && lastMap.TryGetValue(first.ZWORKCODE, out historyPerson);
+            var diffMessage = hasHistory
+                ? string.Join("; ", GetFirstDiffFields(first, historyPerson))
+                : "历史记录不存在";
+            _logger.LogWarning("SAP首条差异 ZWORKCODE:{workCode}, HasHistory:{hasHistory}, Diffs:{diffs}",
+                first.ZWORKCODE, hasHistory, diffMessage);
+        }
+
         return modifiedPersons;
     }
 
@@ -616,4 +628,48 @@ public class GainfoUpdateService : IGainfoUpdateService
         idNo = idNo.TrimStart();
         return idNo[..6];
     }
+
+    private static List<string> GetFirstDiffFields(SapPersonItem current, SapPersonItem history)
+    {
+        var diffs = new List<string>();
+        AddDiff(diffs, "PERNR", current.PERNR, history.PERNR);
+        AddDiff(diffs, "WERKS", current.WERKS, history.WERKS);
+        AddDiff(diffs, "ORGEH", current.ORGEH, history.ORGEH);
+        AddDiff(diffs, "NAME", current.NAME, history.NAME);
+        AddDiff(diffs, "GBDAT", FormatDate(current.GBDAT), FormatDate(history.GBDAT));
+        AddDiff(diffs, "ZZ_SFZH", NormalizeIdNo(current.ZZ_SFZH), NormalizeIdNo(history.ZZ_SFZH));
+        AddDiff(diffs, "ZWORKCODE", current.ZWORKCODE, history.ZWORKCODE);
+        AddDiff(diffs, "ZMOBILE", Normalize(current.ZMOBILE), Normalize(history.ZMOBILE));
+        AddDiff(diffs, "ZSTATUS", Normalize(current.ZSTATUS), Normalize(history.ZSTATUS));
+        AddDiff(diffs, "KOSTL_XJ", Normalize(current.KOSTL_XJ), Normalize(history.KOSTL_XJ));
+        AddDiff(diffs, "NAME2", Normalize(current.NAME2), Normalize(history.NAME2));
+        AddDiff(diffs, "ZZ_ZD", Normalize(current.ZZ_ZD), Normalize(history.ZZ_ZD));
+        AddDiff(diffs, "Z_ZJ", Normalize(current.Z_ZJ), Normalize(history.Z_ZJ));
+        AddDiff(diffs, "ZRZRQ", FormatDate(current.ZRZRQ), FormatDate(history.ZRZRQ));
+        AddDiff(diffs, "ZLZRQ", FormatDate(current.ZLZRQ), FormatDate(history.ZLZRQ));
+        AddDiff(diffs, "PLANS", Normalize(current.PLANS), Normalize(history.PLANS));
+        AddDiff(diffs, "STELL_NM", Normalize(current.STELL_NM), Normalize(history.STELL_NM));
+        AddDiff(diffs, "MASSN", Normalize(current.MASSN), Normalize(history.MASSN));
+        AddDiff(diffs, "MNTXT", Normalize(current.MNTXT), Normalize(history.MNTXT));
+        AddDiff(diffs, "ZZ_GZDJD", Normalize(current.ZZ_GZDJD), Normalize(history.ZZ_GZDJD));
+        AddDiff(diffs, "ZZ_GZDCQ", Normalize(current.ZZ_GZDCQ), Normalize(history.ZZ_GZDCQ));
+
+        return diffs;
+    }
+
+    private static void AddDiff(List<string> diffs, string field, string current, string history)
+    {
+        if (!string.Equals(current ?? string.Empty, history ?? string.Empty, StringComparison.Ordinal))
+        {
+            diffs.Add($"{field}: [{history}] -> [{current}]");
+        }
+    }
+
+    private static string Normalize(string value) => value?.Trim() ?? string.Empty;
+
+    private static string NormalizeIdNo(string value) => value?.TrimStart() ?? string.Empty;
+
+    private static string FormatDate(DateTime? value) => value?.ToString("yyyy-MM-dd HH:mm:ss") ?? string.Empty;
+
+    private static string FormatDate(DateTime value) => value.ToString("yyyy-MM-dd HH:mm:ss");
 }