diff --git a/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationDetailFeatures.cs b/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationDetailFeatures.cs
index 3f6e261..02a7560 100644
--- a/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationDetailFeatures.cs
+++ b/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationDetailFeatures.cs
@@ -165,6 +165,7 @@ public class AddPurchaseEvaluationDetailCommandHandler(
             Action = ChangelogAction.Insert,
             PhaseAtChange = evaluation.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Thêm hạng mục {request.GroupCode} — {request.NoiDung}",
         });
 
@@ -222,6 +223,7 @@ public class UpdatePurchaseEvaluationDetailCommandHandler(
             Action = ChangelogAction.Update,
             PhaseAtChange = evaluation.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Cập nhật hạng mục {request.GroupCode} — {request.NoiDung}{approverNote}",
         });
 
@@ -253,6 +255,7 @@ public class DeletePurchaseEvaluationDetailCommandHandler(
             Action = ChangelogAction.Delete,
             PhaseAtChange = evaluation.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Xóa hạng mục {entity.GroupCode} — {entity.NoiDung}{approverNote}",
         });
 
@@ -312,6 +315,7 @@ public class UpsertPurchaseEvaluationQuoteCommandHandler(
                 Action = ChangelogAction.Update,
                 PhaseAtChange = evaluation.Phase,
                 UserId = currentUser.UserId,
+                UserName = currentUser.FullName ?? currentUser.Email,
                 Summary = $"Cập nhật báo giá cho hạng mục {detail.GroupCode}{approverNote}",
             });
             await db.SaveChangesAsync(ct);
@@ -337,6 +341,7 @@ public class UpsertPurchaseEvaluationQuoteCommandHandler(
             Action = ChangelogAction.Insert,
             PhaseAtChange = evaluation.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Thêm báo giá cho hạng mục {detail.GroupCode}{approverNote}",
         });
         await db.SaveChangesAsync(ct);
@@ -371,6 +376,7 @@ public class DeletePurchaseEvaluationQuoteCommandHandler(
             Action = ChangelogAction.Delete,
             PhaseAtChange = evaluation.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Xóa báo giá{approverNote}",
         });
 
@@ -409,6 +415,7 @@ public class SelectPurchaseEvaluationWinnerCommandHandler(
             Action = ChangelogAction.Update,
             PhaseAtChange = entity.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = "Chọn NCC trúng thầu",
         });
 
diff --git a/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationFeatures.cs b/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationFeatures.cs
index f0cdb4a..888f72b 100644
--- a/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationFeatures.cs
+++ b/src/Backend/SolutionErp.Application/PurchaseEvaluations/PurchaseEvaluationFeatures.cs
@@ -124,6 +124,7 @@ public class CreatePurchaseEvaluationCommandHandler(
             Action = ChangelogAction.Insert,
             PhaseAtChange = entity.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Tạo phiếu {entity.MaPhieu} — {entity.TenGoiThau}",
         });
 
@@ -154,6 +155,7 @@ public class CreatePurchaseEvaluationCommandHandler(
             Action = ChangelogAction.Insert,
             PhaseAtChange = entity.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Hạng mục mặc định — {defaultDetail.NoiDung}",
         });
 
@@ -232,6 +234,7 @@ public class UpdatePurchaseEvaluationDraftCommandHandler(
             Action = ChangelogAction.Update,
             PhaseAtChange = entity.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = "Cập nhật thông tin phiếu",
         });
 
@@ -376,6 +379,8 @@ public class AdjustPurchaseEvaluationBudgetCommandHandler(
         }
         var diffSummary = parts.Count == 0 ? "không đổi" : string.Join(", ", parts);
 
+        // Plan AE S25 — set UserName để FE hiện đúng tên user thay vì "Hệ thống"
+        // fallback. ICurrentUser đã có FullName + Email sẵn từ JWT claims.
         db.PurchaseEvaluationChangelogs.Add(new PurchaseEvaluationChangelog
         {
             PurchaseEvaluationId = entity.Id,
@@ -383,6 +388,7 @@ public class AdjustPurchaseEvaluationBudgetCommandHandler(
             Action = ChangelogAction.Update,
             PhaseAtChange = entity.Phase,
             UserId = currentUser.UserId,
+            UserName = currentUser.FullName ?? currentUser.Email,
             Summary = $"Điều chỉnh ngân sách: {diffSummary} {actorTag}",
         });