diff --git a/downloader/download_image.go b/downloader/download_image.go
index 97e8697..387262b 100644
--- a/downloader/download_image.go
+++ b/downloader/download_image.go
@@ -2,6 +2,7 @@ package downloader
 
 import (
 	"fmt"
+	"os"
 	"path"
 
 	"github.com/samsonmxvi/go-wenku-downloader/util"
@@ -15,7 +16,13 @@ func DownloadImage(url string, dirPath string) error {
 
 	// check file already download
 	if util.CheckFileExist(filePath) {
-		return nil
+		// 获取文件信息
+		fileInfo, _ := os.Stat(filePath)
+		// 获取文件大小
+		fileSize := fileInfo.Size()
+		if fileSize > 0 {
+			return nil
+		}
 	}
 
 	// check dir if not exit create
diff --git a/downloader/download_volume.go b/downloader/download_volume.go
index c787f97..03c3a99 100644
--- a/downloader/download_volume.go
+++ b/downloader/download_volume.go
@@ -6,6 +6,7 @@ import (
 	"log"
 	"os"
 	"path"
+	"strings"
 	"time"
 
 	"github.com/samsonmxvi/go-wenku-downloader/scraper"
@@ -13,7 +14,7 @@ import (
 	"gopkg.in/cheggaaa/pb.v2"
 )
 
-func DownloadVolume(volume *scraper.Volume, dirPath string) error {
+func DownloadVolume(volume *scraper.Volume, dirPath string, onlyWenku8Img bool) error {
 	var imageArray []string
 	imageDirPath := path.Join(dirPath, ImageFolderName)
 
@@ -55,14 +56,18 @@ func DownloadVolume(volume *scraper.Volume, dirPath string) error {
 	progressBar.Finish()
 
 	for _, imageURL := range imageArray {
+		isWenku8Source := strings.Contains(imageURL, "wenku8.com")
+		if !isWenku8Source && onlyWenku8Img {
+			continue
+		}
 		success := false
-		for i := 0; i < 3; i++ {
+		for i := 0; i < RetryTimes; i++ {
 			err := DownloadImage(imageURL, imageDirPath)
 			if err == nil {
 				success = true
 				break
 			} else {
-				time.Sleep(3 * time.Second) // temp fix rate limit
+				time.Sleep(RetryTimer) // temp fix rate limit
 				continue
 			}
 		}
@@ -75,14 +80,14 @@ func DownloadVolume(volume *scraper.Volume, dirPath string) error {
 }
 
 func getChapterArray(volume *scraper.Volume) ([]*scraper.Chapter, error) {
-	for i := 0; i < 3; i++ {
+	for i := 0; i < RetryTimes; i++ {
 		chaterArray, err := scraper.GetChapterArray(volume)
 		if err == nil {
-			time.Sleep(1 * time.Second)
+			time.Sleep(DownloadTimer)
 			return chaterArray, nil
 		} else {
 			log.Printf("获取章节列表失败 %v, 重试第%v次 \n", err, i)
-			time.Sleep(3 * time.Second) // temp fix rate limit
+			time.Sleep(RetryTimer) // temp fix rate limit
 			continue
 		}
 	}
@@ -91,13 +96,13 @@ func getChapterArray(volume *scraper.Volume) ([]*scraper.Chapter, error) {
 
 func getChaterContent(chapter *scraper.Chapter) error {
 	var err error
-	for i := 0; i < 3; i++ {
+	for i := 0; i < RetryTimes; i++ {
 		err = scraper.GetChapterContent(chapter)
 		if err == nil {
-			time.Sleep(1 * time.Second)
+			time.Sleep(DownloadTimer)
 			return nil
 		} else {
-			time.Sleep(3 * time.Second) // temp fix rate limit
+			time.Sleep(RetryTimer) // temp fix rate limit
 			log.Printf("获取章节内容失败 %v, 重试第%v次 \n", err, i)
 			continue
 		}
diff --git a/downloader/download_volume_test.go b/downloader/download_volume_test.go
index 9a434a5..eaec1ab 100644
--- a/downloader/download_volume_test.go
+++ b/downloader/download_volume_test.go
@@ -11,6 +11,6 @@ func TestDownloadVolume(t *testing.T) {
 	volumeArray, err := scraper.GetNovelVolumeArray("https://www.wenku8.net/novel/1/1973/index.htm")
 	require.NoError(t, err)
 	require.NotEmpty(t, volumeArray)
-	err = DownloadVolume(volumeArray[0], "./")
+	err = DownloadVolume(volumeArray[0], "./", true)
 	require.NoError(t, err)
 }
diff --git a/downloader/grab.go b/downloader/grab.go
index a3253b8..aa9fc99 100644
--- a/downloader/grab.go
+++ b/downloader/grab.go
@@ -2,6 +2,7 @@ package downloader
 
 import (
 	"fmt"
+	"log"
 	"time"
 
 	"github.com/cavaliergopher/grab/v3"
@@ -14,7 +15,7 @@ func Grab(path string, url string) error {
 	req, _ := grab.NewRequest(path, url)
 
 	// start download
-	fmt.Printf("Downloading %v...\n", req.URL())
+	log.Printf("正在下载 %v...\n", req.URL())
 	resp := client.Do(req)
 
 	// start UI loop
diff --git a/downloader/variable.go b/downloader/variable.go
index 23adb07..5f68800 100644
--- a/downloader/variable.go
+++ b/downloader/variable.go
@@ -1,6 +1,11 @@
 package downloader
 
+import "time"
+
 var (
 	ErrorJsonName   = "error.json"
 	ImageFolderName = "images"
+	DownloadTimer   = time.Second
+	RetryTimes      = 6
+	RetryTimer      = 6 * time.Second
 )
diff --git a/prompt/download.go b/prompt/download.go
index f998803..a509b5f 100644
--- a/prompt/download.go
+++ b/prompt/download.go
@@ -56,10 +56,16 @@ func download(novelId int) error {
 		return fmt.Errorf("prompt failed %v", err)
 	}
 
+	// get onlyWenku8Img
+	onlyWenku8Img, err := getInputBool("是否只下载wenku8的图片(推荐使用默认数值, 非文库图片资源大多数情况已失效), 默认:y(y/n)", true)
+	if err != nil {
+		return fmt.Errorf("prompt failed %v", err)
+	}
+
 	// download volume
 	for _, volume := range volumeArray {
 		volumePath := path.Join(downloadPath, formatFilename(volume.Name))
-		err = downloader.DownloadVolume(volume, volumePath)
+		err = downloader.DownloadVolume(volume, volumePath, onlyWenku8Img)
 		if err != nil {
 			log.Printf("download volume error %v", err)
 			continue
@@ -114,6 +120,9 @@ func createEpub(novel *scraper.Novel, volumeName string, chapterCount int, cover
 		if len(chapter.Content.Images) != 0 {
 			for _, img := range chapter.Content.Images {
 				imgFile := path.Join(imagePath, util.GetUrlLastString(img))
+				if !util.CheckFileExist(imgFile) {
+					continue
+				}
 				internalPath, _ := util.AddImage(epub, imgFile)
 				xhtml = util.AddImageToXhtml(internalPath, xhtml)
 				imagePathList = append(imagePathList, imgFile)
diff --git a/prompt/get_input.go b/prompt/get_input.go
index 784bfa0..5a0064e 100644
--- a/prompt/get_input.go
+++ b/prompt/get_input.go
@@ -2,6 +2,7 @@ package prompt
 
 import (
 	"errors"
+	"fmt"
 	"regexp"
 	"strconv"
 
@@ -117,3 +118,33 @@ func getSelectedIndex(label string, itmes []string) (int, error) {
 	}
 	return selectedIndex, nil
 }
+
+func getInputBool(label string, defaultValue bool) (bool, error) {
+	validate := func(input string) error {
+		if input == "y" || input == "n" || input == "" {
+			return nil
+		} else {
+			return fmt.Errorf("只能填写y, n")
+		}
+	}
+
+	prompt := promptui.Prompt{
+		Label:    label,
+		Validate: validate,
+		Stdout:   &noBellStdout{},
+	}
+
+	result, err := prompt.Run()
+
+	if err != nil {
+		return false, err
+	}
+
+	if result == "y" {
+		return true, nil
+	} else if result == "n" {
+		return false, nil
+	} else {
+		return defaultValue, nil
+	}
+}
diff --git a/scraper/get_novel_details.go b/scraper/get_novel_details.go
index 14aa3cc..3b290c6 100644
--- a/scraper/get_novel_details.go
+++ b/scraper/get_novel_details.go
@@ -1,6 +1,7 @@
 package scraper
 
 import (
+	"fmt"
 	"regexp"
 	"strconv"
 	"strings"
@@ -21,7 +22,7 @@ func GetNovelDetails(novelId int) (*Novel, error) {
 	}
 
 	if doc.Find(".blocktitle").First().Text() == "出现错误！" {
-		return nil, nil
+		return nil, fmt.Errorf("没有这本小说")
 	}
 
 	getNovelDetailsDoc(doc, novel)