diff --git a/internal/application/repository/knowledge.go b/internal/application/repository/knowledge.go
index b9b118a56..4284fe877 100644
--- a/internal/application/repository/knowledge.go
+++ b/internal/application/repository/knowledge.go
@@ -150,17 +150,29 @@ func (r *knowledgeRepository) CheckKnowledgeExists(
 			return true, &knowledge, nil
 		}
 	} else if params.Type == "url" {
+		// If file hash exists, prioritize exact match using hash
+		if params.FileHash != "" {
+			var knowledge types.Knowledge
+			err := query.Where("type = 'url' AND file_hash = ?", params.FileHash).First(&knowledge).Error
+			if err == nil && knowledge.ID != "" {
+				return true, &knowledge, nil
+			}
+			if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+				return false, nil, err
+			}
+		}
+
 		if params.URL != "" {
 			var knowledge types.Knowledge
 			err := query.Where("type = 'url' AND source = ?", params.URL).First(&knowledge).Error
-			if err != nil {
-				if errors.Is(err, gorm.ErrRecordNotFound) {
-					return false, nil, nil
-				}
+			if err == nil && knowledge.ID != "" {
+				return true, &knowledge, nil
+			}
+			if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
 				return false, nil, err
 			}
-			return true, &knowledge, nil
 		}
+		return false, nil, nil
 	}
 
 	// No valid parameters, default to not existing
diff --git a/internal/application/service/knowledge.go b/internal/application/service/knowledge.go
index bafb66980..2283322a3 100644
--- a/internal/application/service/knowledge.go
+++ b/internal/application/service/knowledge.go
@@ -14,7 +14,6 @@ import (
 	"slices"
 	"sort"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/Tencent/WeKnora/internal/application/service/retriever"
@@ -271,9 +270,11 @@ func (s *knowledgeService) CreateKnowledgeFromURL(ctx context.Context,
 	// Check if URL already exists in the knowledge base
 	tenantID := ctx.Value(types.TenantIDContextKey).(uint)
 	logger.Infof(ctx, "Checking if URL exists, tenant ID: %d", tenantID)
+	fileHash := calculateStr(url)
 	exists, existingKnowledge, err := s.repo.CheckKnowledgeExists(ctx, tenantID, kbID, &types.KnowledgeCheckParams{
-		Type: "url",
-		URL:  url,
+		Type:     "url",
+		URL:      url,
+		FileHash: fileHash,
 	})
 	if err != nil {
 		logger.Errorf(ctx, "Failed to check knowledge existence: %v", err)
@@ -306,6 +307,7 @@ func (s *knowledgeService) CreateKnowledgeFromURL(ctx context.Context,
 		KnowledgeBaseID:  kbID,
 		Type:             "url",
 		Source:           url,
+		FileHash:         fileHash,
 		ParseStatus:      "pending",
 		EnableStatus:     "disabled",
 		CreatedAt:        time.Now(),
@@ -1375,49 +1377,47 @@ func (s *knowledgeService) CloneKnowledgeBase(ctx context.Context, srcID, dstID
 	logger.Infof(ctx, "Knowledge after update to add: %d, delete: %d", len(addKnowledge), len(delKnowledge))
 
 	batch := 10
-	wg := sync.WaitGroup{}
-	errCh := make(chan error, len(delKnowledge))
+	g, gctx := errgroup.WithContext(ctx)
 	for ids := range slices.Chunk(delKnowledge, batch) {
-		wg.Add(1)
-		go func(ids []string) {
-			defer wg.Done()
-			if err := s.DeleteKnowledgeList(ctx, ids); err != nil {
-				errCh <- fmt.Errorf("delete knowledge %v: %w", ids, err)
+		ids = ids
+		g.Go(func() error {
+			err := s.DeleteKnowledgeList(gctx, ids)
+			if err != nil {
+				logger.Errorf(gctx, "delete partial knowledge %v: %w", ids, err)
+				return err
 			}
-		}(ids)
+			return nil
+		})
 	}
-	wg.Wait()
-	close(errCh)
-	for err := range errCh {
-		if err != nil {
-			return err
-		}
+	err = g.Wait()
+	if err != nil {
+		logger.Errorf(ctx, "delete total knowledge %d: %v", len(delKnowledge), err)
+		return err
 	}
 
-	wg = sync.WaitGroup{}
-	errCh = make(chan error, len(addKnowledge)+len(delKnowledge))
-	for ids := range slices.Chunk(addKnowledge, batch) {
-		wg.Add(1)
-		go func(ids []string) {
-			defer wg.Done()
-			for _, kID := range ids {
-				srcKn, err := s.repo.GetKnowledgeByID(ctx, srcKB.TenantID, kID)
-				if err != nil {
-					errCh <- fmt.Errorf("get knowledge %s: %w", kID, err)
-					continue
-				}
-				if err := s.cloneKnowledge(ctx, srcKn, dstKB); err != nil {
-					errCh <- fmt.Errorf("move knowledge %s: %w", kID, err)
-				}
+	// Copy context out of auto-stop task
+	g, gctx = errgroup.WithContext(ctx)
+	g.SetLimit(batch)
+	for _, knowledge := range addKnowledge {
+		knowledge = knowledge
+		g.Go(func() error {
+			srcKn, err := s.repo.GetKnowledgeByID(gctx, srcKB.TenantID, knowledge)
+			if err != nil {
+				logger.Errorf(gctx, "get knowledge %s: %w", knowledge, err)
+				return err
 			}
-		}(ids)
+			err = s.cloneKnowledge(gctx, srcKn, dstKB)
+			if err != nil {
+				logger.Errorf(gctx, "clone knowledge %s: %w", knowledge, err)
+				return err
+			}
+			return nil
+		})
 	}
-	wg.Wait()
-	close(errCh)
-	for err := range errCh {
-		if err != nil {
-			return err
-		}
+	err = g.Wait()
+	if err != nil {
+		logger.Errorf(ctx, "add total knowledge %d: %v", len(addKnowledge), err)
+		return err
 	}
 	return nil
 }
diff --git a/internal/handler/knowledgebase.go b/internal/handler/knowledgebase.go
index c72b6cb5e..29593b1fd 100644
--- a/internal/handler/knowledgebase.go
+++ b/internal/handler/knowledgebase.go
@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"context"
 	"net/http"
 
 	"github.com/Tencent/WeKnora/internal/errors"
@@ -279,13 +280,16 @@ func (h *KnowledgeBaseHandler) CopyKnowledgeBase(c *gin.Context) {
 
 	logger.Infof(ctx, "Copy knowledge base, ID: %s to ID: %s", req.SourceID, req.TargetID)
 
-	err := h.knowledgeService.CloneKnowledgeBase(ctx, req.SourceID, req.TargetID)
-	if err != nil {
-		logger.ErrorWithFields(ctx, err, nil)
-		c.Error(errors.NewInternalServerError(err.Error()))
-		return
-	}
-	logger.Infof(ctx, "Knowledge base copy successfully, ID: %s to ID: %s", req.SourceID, req.TargetID)
+	go func(ctx context.Context) {
+		err := h.knowledgeService.CloneKnowledgeBase(ctx, req.SourceID, req.TargetID)
+		if err != nil {
+			logger.Errorf(ctx, "Failed to copy knowledge base, ID: %s to ID: %s", req.SourceID, req.TargetID)
+			return
+		}
+		logger.Infof(ctx, "Knowledge base copy from ID: %s to ID: %s successfully", req.SourceID, req.TargetID)
+	}(logger.CloneContext(ctx))
+
+	logger.Infof(ctx, "Knowledge base start copy from ID: %s to ID: %s", req.SourceID, req.TargetID)
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,
 		"message": "Knowledge base copy successfully",