diff --git a/internal/ai/rag/index.go b/internal/ai/rag/index.go
index 69e6c99..bd3a0ba 100644
--- a/internal/ai/rag/index.go
+++ b/internal/ai/rag/index.go
@@ -151,7 +151,8 @@ func (s *index) RemoveFAQIndex(ctx context.Context, faqID int64) error {
 	return nil
 }
 
-func (s *index) RemoveKnowledgeBaseIndexByChunkModels(ctx context.Context, knowledgeBaseID int64, chunks []models.KnowledgeChunk) error {
+func (s *index) RemoveKnowledgeBaseIndex(ctx context.Context, knowledgeBaseID int64) error {
+	chunks := repositories.KnowledgeChunkRepository.FindByKnowledgeBaseID(sqls.DB(), knowledgeBaseID)
 	if len(chunks) == 0 {
 		return nil
 	}
diff --git a/internal/repositories/knowledge_chunk_repository.go b/internal/repositories/knowledge_chunk_repository.go
index 566a527..0304e71 100644
--- a/internal/repositories/knowledge_chunk_repository.go
+++ b/internal/repositories/knowledge_chunk_repository.go
@@ -118,6 +118,11 @@ func (r *knowledgeChunkRepository) FindByFaqID(db *gorm.DB, faqID int64) (list [
 	return
 }
 
+func (r *knowledgeChunkRepository) FindByKnowledgeBaseID(db *gorm.DB, knowledgeBaseID int64) (list []models.KnowledgeChunk) {
+	db.Where("knowledge_base_id = ?", knowledgeBaseID).Order("id asc").Find(&list)
+	return
+}
+
 func (r *knowledgeChunkRepository) FindByVectorIDs(db *gorm.DB, vectorIDs []string) (list []models.KnowledgeChunk) {
 	if len(vectorIDs) == 0 {
 		return nil
diff --git a/internal/services/knowledge_base_service.go b/internal/services/knowledge_base_service.go
index 90c6147..b2d4cd4 100644
--- a/internal/services/knowledge_base_service.go
+++ b/internal/services/knowledge_base_service.go
@@ -137,11 +137,11 @@ func (s *knowledgeBaseService) DeleteKnowledgeBase(id int64) error {
 		return errorsx.Forbidden(fmt.Sprintf("知识库已被 %d 个 AI Agent 引用，请先解除绑定", len(referencingAgents)))
 	}
 
-	chunks := repositories.KnowledgeChunkRepository.Find(sqls.DB(), sqls.NewCnd().Eq("knowledge_base_id", id))
+	if err := rag.Index.RemoveKnowledgeBaseIndex(context.Background(), id); err != nil {
+		return err
+	}
+
 	if err := sqls.WithTransaction(func(ctx *sqls.TxContext) error {
-		if err := repositories.KnowledgeChunkRepository.DeleteByKnowledgeBaseID(ctx.Tx, id); err != nil {
-			return err
-		}
 		if err := repositories.KnowledgeDocumentRepository.DeleteByKnowledgeBaseID(ctx.Tx, id); err != nil {
 			return err
 		}
@@ -153,7 +153,7 @@ func (s *knowledgeBaseService) DeleteKnowledgeBase(id int64) error {
 		return err
 	}
 
-	return rag.Index.RemoveKnowledgeBaseIndexByChunkModels(context.Background(), id, chunks)
+	return nil
 }
 
 func (s *knowledgeBaseService) UpdateSort(ids []int64) error {