diff --git a/pkg/conf/conf.go b/pkg/conf/conf.go
index ceeb597..7258646 100644
--- a/pkg/conf/conf.go
+++ b/pkg/conf/conf.go
@@ -70,9 +70,13 @@ type redis struct {
 
 // 缩略图 配置
 type thumb struct {
-	MaxWidth   uint
-	MaxHeight  uint
-	FileSuffix string `validate:"min=1"`
+	MaxWidth      uint
+	MaxHeight     uint
+	FileSuffix    string `validate:"min=1"`
+	MaxTaskCount  int
+	EncodeMethod  string `validate:"eq=jpg|eq=png"`
+	EncodeQuality int    `validate:"gte=1,lte=100"`
+	GCAfterGen    bool
 }
 
 // 跨域配置
diff --git a/pkg/conf/defaults.go b/pkg/conf/defaults.go
index 64a3721..cbc0e07 100644
--- a/pkg/conf/defaults.go
+++ b/pkg/conf/defaults.go
@@ -51,9 +51,13 @@ var CORSConfig = &cors{
 
 // ThumbConfig 缩略图配置
 var ThumbConfig = &thumb{
-	MaxWidth:   400,
-	MaxHeight:  300,
-	FileSuffix: "._thumb",
+	MaxWidth:      400,
+	MaxHeight:     300,
+	FileSuffix:    "._thumb",
+	MaxTaskCount:  -1,
+	EncodeMethod:  "jpg",
+	GCAfterGen:    false,
+	EncodeQuality: 85,
 }
 
 // SlaveConfig 从机配置
diff --git a/pkg/filesystem/image.go b/pkg/filesystem/image.go
index 99a24a2..759ebca 100644
--- a/pkg/filesystem/image.go
+++ b/pkg/filesystem/image.go
@@ -65,20 +65,23 @@ type Pool struct {
 // Init 初始化任务池
 func getThumbWorker() *Pool {
 	once.Do(func() {
-		maxWorker := model.GetIntSetting("max_thumb_worker_num", runtime.GOMAXPROCS(0))
+		maxWorker := conf.ThumbConfig.MaxTaskCount
+		if maxWorker <= 0 {
+			maxWorker = runtime.GOMAXPROCS(0)
+		}
 		thumbPool = &Pool{
 			worker: make(chan int, maxWorker),
 		}
-		util.Log().Info("初始化Thumb任务队列，WorkerNum = %d", maxWorker)
+		util.Log().Debug("初始化Thumb任务队列，WorkerNum = %d", maxWorker)
 	})
 	return thumbPool
 }
 func (pool *Pool) addWorker() {
 	pool.worker <- 1
-	util.Log().Info("Thumb任务队列，addWorker")
+	util.Log().Debug("Thumb任务队列，addWorker")
 }
 func (pool *Pool) releaseWorker() {
-	util.Log().Info("Thumb任务队列，releaseWorker")
+	util.Log().Debug("Thumb任务队列，releaseWorker")
 	<-pool.worker
 }
 
@@ -116,6 +119,12 @@ func (fs *FileSystem) GenerateThumbnail(ctx context.Context, file *model.File) {
 	image.GetThumb(fs.GenerateThumbnailSize(w, h))
 	// 保存到文件
 	err = image.Save(util.RelativePath(file.SourceName + conf.ThumbConfig.FileSuffix))
+	image = nil
+	if conf.ThumbConfig.GCAfterGen {
+		util.Log().Debug("GenerateThumbnail runtime.GC")
+		runtime.GC()
+	}
+
 	if err != nil {
 		util.Log().Warning("无法保存缩略图：%s", err)
 		return
diff --git a/pkg/thumb/image.go b/pkg/thumb/image.go
index a6e6d9e..7b02620 100644
--- a/pkg/thumb/image.go
+++ b/pkg/thumb/image.go
@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	model "github.com/cloudreve/Cloudreve/v3/models"
+	"github.com/cloudreve/Cloudreve/v3/pkg/conf"
 	"github.com/cloudreve/Cloudreve/v3/pkg/util"
 
 	//"github.com/nfnt/resize"
@@ -77,8 +78,13 @@ func (image *Thumb) Save(path string) (err error) {
 		return err
 	}
 	defer out.Close()
+	switch conf.ThumbConfig.EncodeMethod {
+	case "png":
+		err = png.Encode(out, image.src)
+	default:
+		err = jpeg.Encode(out, image.src, &jpeg.Options{Quality: conf.ThumbConfig.EncodeQuality})
+	}
 
-	err = png.Encode(out, image.src)
 	return err
 
 }
diff --git a/routers/controllers/file.go b/routers/controllers/file.go
index bc19497..52d4314 100644
--- a/routers/controllers/file.go
+++ b/routers/controllers/file.go
@@ -10,6 +10,7 @@ import (
 	"sync"
 
 	model "github.com/cloudreve/Cloudreve/v3/models"
+	"github.com/cloudreve/Cloudreve/v3/pkg/conf"
 	"github.com/cloudreve/Cloudreve/v3/pkg/filesystem"
 	"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/driver/local"
 	"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/fsctx"
@@ -180,7 +181,7 @@ func Thumb(c *gin.Context) {
 	}
 
 	defer resp.Content.Close()
-	http.ServeContent(c.Writer, c.Request, "thumb.png", fs.FileTarget[0].UpdatedAt, resp.Content)
+	http.ServeContent(c.Writer, c.Request, "thumb."+conf.ThumbConfig.EncodeMethod, fs.FileTarget[0].UpdatedAt, resp.Content)
 
 }