diff --git a/internal/caches/partial_ranges.go b/internal/caches/partial_ranges.go
index 52b5a1c..5333a7a 100644
--- a/internal/caches/partial_ranges.go
+++ b/internal/caches/partial_ranges.go
@@ -10,17 +10,21 @@ import (
 
 // PartialRanges 内容分区范围定义
 type PartialRanges struct {
-	Ranges [][2]int64 `json:"ranges"`
+	ExpiresAt int64      `json:"expiresAt"` // 过期时间
+	Ranges    [][2]int64 `json:"ranges"`
 }
 
 // NewPartialRanges 获取新对象
-func NewPartialRanges() *PartialRanges {
-	return &PartialRanges{Ranges: [][2]int64{}}
+func NewPartialRanges(expiresAt int64) *PartialRanges {
+	return &PartialRanges{
+		Ranges:    [][2]int64{},
+		ExpiresAt: expiresAt,
+	}
 }
 
 // NewPartialRangesFromJSON 从JSON中解析范围
 func NewPartialRangesFromJSON(data []byte) (*PartialRanges, error) {
-	var rs = NewPartialRanges()
+	var rs = NewPartialRanges(0)
 	err := json.Unmarshal(data, &rs)
 	if err != nil {
 		return nil, err
@@ -135,6 +139,10 @@ func (this *PartialRanges) Max() int64 {
 	return 0
 }
 
+func (this *PartialRanges) Reset() {
+	this.Ranges = [][2]int64{}
+}
+
 func (this *PartialRanges) merge(index int) {
 	// forward
 	var lastIndex = index
diff --git a/internal/caches/partial_ranges_test.go b/internal/caches/partial_ranges_test.go
index 956ea98..0cf5a38 100644
--- a/internal/caches/partial_ranges_test.go
+++ b/internal/caches/partial_ranges_test.go
@@ -10,7 +10,7 @@ import (
 )
 
 func TestNewPartialRanges(t *testing.T) {
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	r.Add(1, 100)
 	r.Add(50, 300)
 
@@ -28,7 +28,7 @@ func TestNewPartialRanges(t *testing.T) {
 func TestNewPartialRanges1(t *testing.T) {
 	var a = assert.NewAssertion(t)
 
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	r.Add(1, 100)
 	r.Add(1, 101)
 	r.Add(1, 102)
@@ -47,7 +47,7 @@ func TestNewPartialRanges1(t *testing.T) {
 
 func TestNewPartialRanges2(t *testing.T) {
 	// low -> high
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	r.Add(1, 100)
 	r.Add(1, 101)
 	r.Add(1, 102)
@@ -63,7 +63,7 @@ func TestNewPartialRanges2(t *testing.T) {
 
 func TestNewPartialRanges3(t *testing.T) {
 	// high -> low
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	r.Add(301, 302)
 	r.Add(303, 304)
 	r.Add(200, 300)
@@ -75,7 +75,7 @@ func TestNewPartialRanges3(t *testing.T) {
 
 func TestNewPartialRanges4(t *testing.T) {
 	// nearby
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	r.Add(301, 302)
 	r.Add(303, 304)
 	r.Add(305, 306)
@@ -90,7 +90,7 @@ func TestNewPartialRanges4(t *testing.T) {
 }
 
 func TestNewPartialRanges5(t *testing.T) {
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	for j := 0; j < 1000; j++ {
 		r.Add(int64(j), int64(j+100))
 	}
@@ -100,7 +100,7 @@ func TestNewPartialRanges5(t *testing.T) {
 func TestNewPartialRanges_Nearest(t *testing.T) {
 	{
 		// nearby
-		var r = caches.NewPartialRanges()
+		var r = caches.NewPartialRanges(0)
 		r.Add(301, 400)
 		r.Add(401, 500)
 		r.Add(501, 600)
@@ -112,7 +112,7 @@ func TestNewPartialRanges_Nearest(t *testing.T) {
 
 	{
 		// nearby
-		var r = caches.NewPartialRanges()
+		var r = caches.NewPartialRanges(0)
 		r.Add(301, 400)
 		r.Add(450, 500)
 		r.Add(550, 600)
@@ -131,7 +131,7 @@ func TestNewPartialRanges_Large_Range(t *testing.T) {
 	var largeSize int64 = 10000000000000
 	t.Log(largeSize/1024/1024/1024, "G")
 
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	r.Add(1, largeSize)
 	jsonData, err := r.AsJSON()
 	if err != nil {
@@ -148,7 +148,7 @@ func TestNewPartialRanges_Large_Range(t *testing.T) {
 }
 
 func TestNewPartialRanges_AsJSON(t *testing.T) {
-	var r = caches.NewPartialRanges()
+	var r = caches.NewPartialRanges(0)
 	for j := 0; j < 1000; j++ {
 		r.Add(int64(j), int64(j+100))
 	}
@@ -167,7 +167,7 @@ func TestNewPartialRanges_AsJSON(t *testing.T) {
 
 func BenchmarkNewPartialRanges(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		var r = caches.NewPartialRanges()
+		var r = caches.NewPartialRanges(0)
 		for j := 0; j < 1000; j++ {
 			r.Add(int64(j), int64(j+100))
 		}
diff --git a/internal/caches/reader_partial_file.go b/internal/caches/reader_partial_file.go
index 8ed81d0..96dcc81 100644
--- a/internal/caches/reader_partial_file.go
+++ b/internal/caches/reader_partial_file.go
@@ -117,13 +117,10 @@ func (this *PartialFileReader) ContainsRange(r rangeutils.Range) (r2 rangeutils.
 	r2, ok = this.ranges.Nearest(r.Start(), r.End())
 	if ok && this.bodySize > 0 {
 		// 考虑可配置
-		var span int64 = 512 * 1024
-		if this.bodySize > 1<<30 {
-			span = 1 << 20
-		}
+		const minSpan = 128 << 10
 
 		// 这里限制返回的最小缓存，防止因为返回的内容过小而导致请求过多
-		if r2.Length() < r.Length() && r2.Length() < span {
+		if r2.Length() < r.Length() && r2.Length() < minSpan {
 			ok = false
 		}
 	}
@@ -138,6 +135,10 @@ func (this *PartialFileReader) MaxLength() int64 {
 	return this.ranges.Max() + 1
 }
 
+func (this *PartialFileReader) Ranges() *PartialRanges {
+	return this.ranges
+}
+
 func (this *PartialFileReader) discard() error {
 	_ = os.Remove(this.rangePath)
 	return this.FileReader.discard()
diff --git a/internal/caches/storage_file.go b/internal/caches/storage_file.go
index 7dccc00..1ad9de9 100644
--- a/internal/caches/storage_file.go
+++ b/internal/caches/storage_file.go
@@ -544,19 +544,28 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, hea
 	// 从已经存储的内容中读取信息
 	var isNewCreated = true
 	var partialBodyOffset int64
+	var partialRanges *PartialRanges
 	if isPartial {
-		readerFp, err := os.OpenFile(tmpPath, os.O_RDONLY, 0444)
-		if err == nil {
-			var partialReader = NewPartialFileReader(readerFp)
-			err = partialReader.Init()
-			_ = partialReader.Close()
-			if err == nil && partialReader.bodyOffset > 0 {
-				isNewCreated = false
-				partialBodyOffset = partialReader.bodyOffset
-			} else {
-				_ = this.removeCacheFile(tmpPath)
+		// 数据库中是否存在
+		existsCacheItem, _ := this.list.Exist(hash)
+		if existsCacheItem {
+			readerFp, err := os.OpenFile(tmpPath, os.O_RDONLY, 0444)
+			if err == nil {
+				var partialReader = NewPartialFileReader(readerFp)
+				err = partialReader.Init()
+				_ = partialReader.Close()
+				if err == nil && partialReader.bodyOffset > 0 {
+					partialRanges = partialReader.Ranges()
+					isNewCreated = false
+					partialBodyOffset = partialReader.bodyOffset
+				} else {
+					_ = this.removeCacheFile(tmpPath)
+				}
 			}
 		}
+		if partialRanges == nil {
+			partialRanges = NewPartialRanges(expiredAt)
+		}
 	}
 
 	var flags = os.O_CREATE | os.O_WRONLY
@@ -641,12 +650,7 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, hea
 
 	isOk = true
 	if isPartial {
-		ranges, err := NewPartialRangesFromFile(cachePathName + "@ranges.cache")
-		if err != nil {
-			ranges = NewPartialRanges()
-		}
-
-		return NewPartialFileWriter(writer, key, expiredAt, isNewCreated, isPartial, partialBodyOffset, ranges, func() {
+		return NewPartialFileWriter(writer, key, expiredAt, isNewCreated, isPartial, partialBodyOffset, partialRanges, func() {
 			sharedWritingFileKeyLocker.Lock()
 			delete(sharedWritingFileKeyMap, key)
 			if len(sharedWritingFileKeyMap) == 0 {
diff --git a/internal/caches/writer_partial_file.go b/internal/caches/writer_partial_file.go
index 0429212..1b48c2d 100644
--- a/internal/caches/writer_partial_file.go
+++ b/internal/caches/writer_partial_file.go
@@ -152,6 +152,8 @@ func (this *PartialFileWriter) Close() error {
 
 	err := this.ranges.WriteToFile(this.rangePath)
 	if err != nil {
+		_ = this.rawWriter.Close()
+		this.remove()
 		return err
 	}
 
diff --git a/internal/caches/writer_partial_file_test.go b/internal/caches/writer_partial_file_test.go
index e1cfb48..91eba70 100644
--- a/internal/caches/writer_partial_file_test.go
+++ b/internal/caches/writer_partial_file_test.go
@@ -26,7 +26,7 @@ func TestPartialFileWriter_Write(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	var ranges = caches.NewPartialRanges()
+	var ranges = caches.NewPartialRanges(0)
 	var writer = caches.NewPartialFileWriter(fp, "test", time.Now().Unix()+86500, true, true, 0, ranges, func() {
 		t.Log("end")
 	})
diff --git a/internal/nodes/http_request_cache.go b/internal/nodes/http_request_cache.go
index 3afc627..a416733 100644
--- a/internal/nodes/http_request_cache.go
+++ b/internal/nodes/http_request_cache.go
@@ -628,7 +628,14 @@ func (this *HTTPRequest) tryPartialReader(storage caches.StorageInterface, key s
 	}()
 
 	// 检查范围
+	const maxFirstSpan = 16 << 20 // TODO 可以在缓存策略中设置此值
 	for index, r := range ranges {
+		// 没有指定结束字节时，自动指定一个
+		if r.Start() >= 0 && r.End() == -1 {
+			if partialReader.MaxLength() > r.Start()+maxFirstSpan {
+				r[1] = r.Start() + maxFirstSpan
+			}
+		}
 		r1, ok := r.Convert(partialReader.MaxLength())
 		if !ok {
 			return nil, nil
diff --git a/internal/nodes/http_writer.go b/internal/nodes/http_writer.go
index a86e1f9..487ec3e 100644
--- a/internal/nodes/http_writer.go
+++ b/internal/nodes/http_writer.go
@@ -326,7 +326,7 @@ func (this *HTTPWriter) PrepareCache(resp *http.Response, size int64) {
 	// 写入Header
 	var headerBuf = utils.SharedBufferPool.Get()
 	for k, v := range this.Header() {
-		if k == "Set-Cookie" {
+		if k == "Set-Cookie" || (this.isPartial && k == "Content-Range") {
 			continue
 		}
 		for _, v1 := range v {
@@ -649,7 +649,7 @@ func (this *HTTPWriter) PrepareCompression(resp *http.Response, size int64) {
 		// 写入Header
 		var headerBuffer = utils.SharedBufferPool.Get()
 		for k, v := range this.Header() {
-			if k == "Set-Cookie" {
+			if k == "Set-Cookie" || (this.isPartial && k == "Content-Range") {
 				continue
 			}
 			for _, v1 := range v {
@@ -1193,7 +1193,7 @@ func (this *HTTPWriter) finishRequest() {
 // 计算Header长度
 func (this *HTTPWriter) calculateHeaderLength() (result int) {
 	for k, v := range this.Header() {
-		if k == "Set-Cookie" {
+		if k == "Set-Cookie" || (this.isPartial && k == "Content-Range") {
 			continue
 		}
 		for _, v1 := range v {
diff --git a/internal/utils/ranges/range_test.go b/internal/utils/ranges/range_test.go
index 29df200..73ec1b3 100644
--- a/internal/utils/ranges/range_test.go
+++ b/internal/utils/ranges/range_test.go
@@ -67,3 +67,10 @@ func TestRange_ComposeContentRangeHeader(t *testing.T) {
 	var r = rangeutils.NewRange(1, 100)
 	t.Log(r.ComposeContentRangeHeader("1000"))
 }
+
+func TestRange_SetLength(t *testing.T) {
+	var r = rangeutils.NewRange(1, 100)
+	t.Log(r)
+
+	t.Log(r.SetLength(1024))
+}