diff --git a/weed/filer/filechunk_section.go b/weed/filer/filechunk_section.go
index 5804c7160..3fbfb396d 100644
--- a/weed/filer/filechunk_section.go
+++ b/weed/filer/filechunk_section.go
@@ -33,16 +33,7 @@ func (section *FileChunkSection) addChunk(chunk *filer_pb.FileChunk) error {
 	if section.visibleIntervals != nil {
 		MergeIntoVisibles(section.visibleIntervals, start, stop, chunk)
 		garbageFileIds := FindGarbageChunks(section.visibleIntervals, start, stop)
-		for _, garbageFileId := range garbageFileIds {
-			length := len(section.chunks)
-			for i, t := range section.chunks {
-				if t.FileId == garbageFileId {
-					section.chunks[i] = section.chunks[length-1]
-					section.chunks = section.chunks[:length-1]
-					break
-				}
-			}
-		}
+		removeGarbageChunks(section, garbageFileIds)
 	}
 
 	if section.chunkViews != nil {
@@ -52,6 +43,22 @@ func (section *FileChunkSection) addChunk(chunk *filer_pb.FileChunk) error {
 	return nil
 }
 
+func removeGarbageChunks(section *FileChunkSection, garbageFileIds map[string]struct{}) {
+	now := time.Now()
+	for i := 0; i < len(section.chunks); {
+		t := section.chunks[i]
+		length := len(section.chunks)
+		if _, found := garbageFileIds[t.FileId]; found {
+			if i < length-1 {
+				section.chunks[i] = section.chunks[length-1]
+			}
+			section.chunks = section.chunks[:length-1]
+		} else {
+			i++
+		}
+	}
+}
+
 func (section *FileChunkSection) setupForRead(group *ChunkGroup, fileSize int64) {
 	if section.visibleIntervals == nil {
 		section.visibleIntervals = readResolvedChunks(section.chunks, int64(section.sectionIndex)*SectionSize, (int64(section.sectionIndex)+1)*SectionSize)
diff --git a/weed/filer/filechunk_section_test.go b/weed/filer/filechunk_section_test.go
new file mode 100644
index 000000000..e4536540b
--- /dev/null
+++ b/weed/filer/filechunk_section_test.go
@@ -0,0 +1,48 @@
+package filer
+
+import (
+	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"testing"
+)
+
+func Test_removeGarbageChunks(t *testing.T) {
+	section := NewFileChunkSection(0)
+	section.addChunk(&filer_pb.FileChunk{
+		FileId:       "0",
+		Offset:       0,
+		Size:         1,
+		ModifiedTsNs: 0,
+	})
+	section.addChunk(&filer_pb.FileChunk{
+		FileId:       "1",
+		Offset:       1,
+		Size:         1,
+		ModifiedTsNs: 1,
+	})
+	section.addChunk(&filer_pb.FileChunk{
+		FileId:       "2",
+		Offset:       2,
+		Size:         1,
+		ModifiedTsNs: 2,
+	})
+	section.addChunk(&filer_pb.FileChunk{
+		FileId:       "3",
+		Offset:       3,
+		Size:         1,
+		ModifiedTsNs: 3,
+	})
+	section.addChunk(&filer_pb.FileChunk{
+		FileId:       "4",
+		Offset:       4,
+		Size:         1,
+		ModifiedTsNs: 4,
+	})
+	garbageFileIds := make(map[string]struct{})
+	garbageFileIds["0"] = struct{}{}
+	garbageFileIds["2"] = struct{}{}
+	garbageFileIds["4"] = struct{}{}
+	removeGarbageChunks(section, garbageFileIds)
+	if len(section.chunks) != 2 {
+		t.Errorf("remove chunk 2 failed")
+	}
+}
diff --git a/weed/filer/filechunks.go b/weed/filer/filechunks.go
index 480478fd7..7c8bb2fe1 100644
--- a/weed/filer/filechunks.go
+++ b/weed/filer/filechunks.go
@@ -86,12 +86,13 @@ func SeparateGarbageChunks(visibles *IntervalList[*VisibleInterval], chunks []*f
 	return compacted, garbage
 }
 
-func FindGarbageChunks(visibles *IntervalList[*VisibleInterval], start int64, stop int64) (garbageFileId []string) {
+func FindGarbageChunks(visibles *IntervalList[*VisibleInterval], start int64, stop int64) (garbageFileIds map[string]struct{}) {
+	garbageFileIds = make(map[string]struct{})
 	for x := visibles.Front(); x != nil; x = x.Next {
 		interval := x.Value
 		offset := interval.start - interval.offsetInChunk
 		if start <= offset && offset+int64(interval.chunkSize) <= stop {
-			garbageFileId = append(garbageFileId, interval.fileId)
+			garbageFileIds[interval.fileId] = struct{}{}
 		}
 	}
 	return