diff --git a/internal/application/service/agent_service.go b/internal/application/service/agent_service.go
index bf25a26fa..986d47e4b 100644
--- a/internal/application/service/agent_service.go
+++ b/internal/application/service/agent_service.go
@@ -14,6 +14,7 @@ import (
 	"github.com/Tencent/WeKnora/internal/models/rerank"
 	"github.com/Tencent/WeKnora/internal/types"
 	"github.com/Tencent/WeKnora/internal/types/interfaces"
+	secutils "github.com/Tencent/WeKnora/internal/utils"
 	"gorm.io/gorm"
 )
 
@@ -267,7 +268,7 @@ func (s *agentService) getKnowledgeBaseInfos(ctx context.Context, kbIDs []string
 		// Get knowledge base details
 		kb, err := s.knowledgeBaseService.GetKnowledgeBaseByID(ctx, kbID)
 		if err != nil {
-			logger.Warnf(ctx, "Failed to get knowledge base %s: %v", kbID, err)
+			logger.Warnf(ctx, "Failed to get knowledge base %s: %v", secutils.SanitizeForLog(kbID), err)
 			// Add fallback info
 			kbInfos = append(kbInfos, &agent.KnowledgeBaseInfo{
 				ID:          kbID,
diff --git a/internal/application/service/chunk.go b/internal/application/service/chunk.go
index 803baf703..384582a27 100644
--- a/internal/application/service/chunk.go
+++ b/internal/application/service/chunk.go
@@ -87,7 +87,6 @@ func (s *chunkService) GetChunkByID(ctx context.Context, id string) (*types.Chun
 	chunk, err := s.chunkRepository.GetChunkByID(ctx, tenantID, id)
 	if err != nil {
 		logger.ErrorWithFields(ctx, err, map[string]interface{}{
-			"chunk_id":  id,
 			"tenant_id": tenantID,
 		})
 		return nil, err
@@ -213,7 +212,6 @@ func (s *chunkService) DeleteChunk(ctx context.Context, id string) error {
 	err := s.chunkRepository.DeleteChunk(ctx, tenantID, id)
 	if err != nil {
 		logger.ErrorWithFields(ctx, err, map[string]interface{}{
-			"chunk_id":  id,
 			"tenant_id": tenantID,
 		})
 		return err
diff --git a/internal/application/service/knowledgebase.go b/internal/application/service/knowledgebase.go
index 9a673c14f..77df990fa 100644
--- a/internal/application/service/knowledgebase.go
+++ b/internal/application/service/knowledgebase.go
@@ -546,8 +546,7 @@ func (s *knowledgeBaseService) HybridSearch(ctx context.Context,
 	needsIterativeRetrieval := len(deduplicatedChunks) < params.MatchCount &&
 		kb.Type == types.KnowledgeBaseTypeFAQ && len(matchResults) == matchCount
 	if needsIterativeRetrieval {
-		logger.Infof(ctx, "Not enough unique chunks (%d < %d), using iterative retrieval for FAQ",
-			len(deduplicatedChunks), params.MatchCount)
+		logger.Info(ctx, "Not enough unique chunks, using iterative retrieval for FAQ")
 		// Use iterative retrieval to get more unique chunks (with negative question filtering inside)
 		deduplicatedChunks = s.iterativeRetrieveWithDeduplication(ctx, retrieveEngine, retrieveParams, params.MatchCount, params.QueryText)
 	} else if kb.Type == types.KnowledgeBaseTypeFAQ {
diff --git a/internal/application/service/session.go b/internal/application/service/session.go
index 537c57af9..18d500577 100644
--- a/internal/application/service/session.go
+++ b/internal/application/service/session.go
@@ -606,13 +606,13 @@ func (s *sessionService) selectChatModelID(ctx context.Context, session *types.S
 		for _, kbID := range knowledgeBaseIDs {
 			kb, err := s.knowledgeBaseService.GetKnowledgeBaseByID(ctx, kbID)
 			if err != nil {
-				logger.Warnf(ctx, "Failed to get knowledge base %s: %v", kbID, err)
+				logger.Warnf(ctx, "Failed to get knowledge base: %v", err)
 				continue
 			}
 			if kb != nil && kb.SummaryModelID != "" {
 				model, err := s.modelService.GetModelByID(ctx, kb.SummaryModelID)
 				if err == nil && model != nil && model.Source == types.ModelSourceRemote {
-					logger.Infof(ctx, "Using Remote summary model from knowledge base %s: %s", kbID, kb.SummaryModelID)
+					logger.Info(ctx, "Using Remote summary model from knowledge base")
 					return kb.SummaryModelID, nil
 				}
 			}