diff --git a/internal/repositories/knowledge_document_repository.go b/internal/repositories/knowledge_document_repository.go
index 922254c..476e9d3 100644
--- a/internal/repositories/knowledge_document_repository.go
+++ b/internal/repositories/knowledge_document_repository.go
@@ -80,6 +80,14 @@ func (r *knowledgeDocumentRepository) Count(db *gorm.DB, cnd *sqls.Cnd) int64 {
 	return cnd.Count(db, &models.KnowledgeDocument{})
 }
 
+func (r *knowledgeDocumentRepository) CountActiveByDirectoryID(db *gorm.DB, directoryID int64) int64 {
+	var count int64
+	db.Model(&models.KnowledgeDocument{}).
+		Where("directory_id = ? AND status <> ?", directoryID, enums.StatusDeleted).
+		Count(&count)
+	return count
+}
+
 func (r *knowledgeDocumentRepository) Create(db *gorm.DB, t *models.KnowledgeDocument) (err error) {
 	err = db.Create(t).Error
 	return
diff --git a/internal/repositories/knowledge_faq_repository.go b/internal/repositories/knowledge_faq_repository.go
index e1bd35f..600b148 100644
--- a/internal/repositories/knowledge_faq_repository.go
+++ b/internal/repositories/knowledge_faq_repository.go
@@ -50,6 +50,14 @@ func (r *knowledgeFAQRepository) Count(db *gorm.DB, cnd *sqls.Cnd) int64 {
 	return cnd.Count(db, &models.KnowledgeFAQ{})
 }
 
+func (r *knowledgeFAQRepository) CountActiveByDirectoryID(db *gorm.DB, directoryID int64) int64 {
+	var count int64
+	db.Model(&models.KnowledgeFAQ{}).
+		Where("directory_id = ? AND status <> ?", directoryID, enums.StatusDeleted).
+		Count(&count)
+	return count
+}
+
 func (r *knowledgeFAQRepository) Create(db *gorm.DB, t *models.KnowledgeFAQ) error {
 	return db.Create(t).Error
 }
diff --git a/internal/services/knowledge_directory_service.go b/internal/services/knowledge_directory_service.go
index 29cb089..488f5e5 100644
--- a/internal/services/knowledge_directory_service.go
+++ b/internal/services/knowledge_directory_service.go
@@ -117,10 +117,10 @@ func (s *knowledgeDirectoryService) DeleteDirectory(id int64) error {
 	if s.Count(sqls.NewCnd().Eq("parent_id", id)) > 0 {
 		return errorsx.InvalidParamI18n("error.e0316")
 	}
-	if KnowledgeDocumentService.Count(sqls.NewCnd().Eq("directory_id", id)) > 0 {
+	if repositories.KnowledgeDocumentRepository.CountActiveByDirectoryID(sqls.DB(), id) > 0 {
 		return errorsx.InvalidParamI18n("error.e0317")
 	}
-	if KnowledgeFAQService.Count(sqls.NewCnd().Eq("directory_id", id)) > 0 {
+	if repositories.KnowledgeFAQRepository.CountActiveByDirectoryID(sqls.DB(), id) > 0 {
 		return errorsx.InvalidParamI18n("error.e0315")
 	}
 	return repositories.KnowledgeDirectoryRepository.Delete(sqls.DB(), id)
diff --git a/internal/services/knowledge_directory_service_test.go b/internal/services/knowledge_directory_service_test.go
index a7fdedd..e12eee5 100644
--- a/internal/services/knowledge_directory_service_test.go
+++ b/internal/services/knowledge_directory_service_test.go
@@ -93,6 +93,33 @@ func TestKnowledgeDirectoryDeleteRejectsAttachedContent(t *testing.T) {
 	}
 }
 
+func TestKnowledgeDirectoryDeleteAllowsSoftDeletedDocument(t *testing.T) {
+	setupKnowledgeDirectoryTestDB(t)
+	operator := knowledgeDirectoryTestOperator()
+	kb := createKnowledgeDirectoryTestBase(t, "Document KB", string(enums.KnowledgeBaseTypeDocument))
+	directory, err := KnowledgeDirectoryService.CreateDirectory(request.CreateKnowledgeDirectoryRequest{
+		KnowledgeBaseID: kb.ID,
+		Name:            "已清空目录",
+	}, operator)
+	if err != nil {
+		t.Fatalf("create directory: %v", err)
+	}
+	if err := repositories.KnowledgeDocumentRepository.Create(sqls.DB(), &models.KnowledgeDocument{
+		KnowledgeBaseID: kb.ID,
+		DirectoryID:     directory.ID,
+		Title:           "Deleted Doc",
+		ContentType:     enums.KnowledgeDocumentContentTypeMarkdown,
+		Status:          enums.StatusDeleted,
+		IndexStatus:     enums.KnowledgeDocumentIndexStatusPending,
+	}); err != nil {
+		t.Fatalf("create soft deleted document: %v", err)
+	}
+
+	if err := KnowledgeDirectoryService.DeleteDirectory(directory.ID); err != nil {
+		t.Fatalf("DeleteDirectory() error = %v, want nil when only soft deleted documents exist", err)
+	}
+}
+
 func setupKnowledgeDirectoryTestDB(t *testing.T) {
 	t.Helper()
 	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=shared"), &gorm.Config{})