diff --git a/internal/application/repository/tag.go b/internal/application/repository/tag.go
index 907ab8bc..c90a59db 100644
--- a/internal/application/repository/tag.go
+++ b/internal/application/repository/tag.go
@@ -122,7 +122,7 @@ func (r *knowledgeTagRepository) ListByKB(
 
 	var tags []*types.KnowledgeTag
 	if err := dataQuery.
-		Order("sort_order ASC, created_at ASC").
+		Order("sort_order ASC, created_at DESC").
 		Offset(page.Offset()).
 		Limit(page.Limit()).
 		Find(&tags).Error; err != nil {
diff --git a/internal/application/service/knowledge.go b/internal/application/service/knowledge.go
index 3bee9cc6..0ec7fbc6 100644
--- a/internal/application/service/knowledge.go
+++ b/internal/application/service/knowledge.go
@@ -7034,13 +7034,18 @@ func (s *knowledgeService) getOrCreateTagInTarget(
 	}
 
 	// Create new tag in target KB
+	// "未分类" tag should have the lowest sort order to appear first
+	sortOrder := srcTag.SortOrder
+	if srcTag.Name == types.UntaggedTagName {
+		sortOrder = -1
+	}
 	newTag := &types.KnowledgeTag{
 		ID:              uuid.New().String(),
 		TenantID:        dstTenantID,
 		KnowledgeBaseID: dstKnowledgeBaseID,
 		Name:            srcTag.Name,
 		Color:           srcTag.Color,
-		SortOrder:       srcTag.SortOrder,
+		SortOrder:       sortOrder,
 		CreatedAt:       time.Now(),
 		UpdatedAt:       time.Now(),
 	}
diff --git a/internal/application/service/tag.go b/internal/application/service/tag.go
index 5cf60543..e7fcfdbe 100644
--- a/internal/application/service/tag.go
+++ b/internal/application/service/tag.go
@@ -123,6 +123,10 @@ func (s *knowledgeTagService) CreateTag(
 	}
 
 	now := time.Now()
+	// "未分类" tag should have the lowest sort order to appear first
+	if name == types.UntaggedTagName {
+		sortOrder = -1
+	}
 	tag := &types.KnowledgeTag{
 		ID:              uuid.New().String(),
 		TenantID:        kb.TenantID,