diff --git a/pkg/filesystem/driver/cos/handler.go b/pkg/filesystem/driver/cos/handler.go
index 63e5c4a..906bdf6 100644
--- a/pkg/filesystem/driver/cos/handler.go
+++ b/pkg/filesystem/driver/cos/handler.go
@@ -360,7 +360,7 @@ func signCDNURL(rawUrl string) (string, error) {
 	}
 	nonce := strings.Replace(random.String(), "-", "", 4)
 	uid := "0"
-	signatureString := fmt.Sprintf("%s-%d-%s-%s-%s", parsedUrl.Path, timestamp, nonce, uid, cdnSignKey)
+	signatureString := fmt.Sprintf("%s-%d-%s-%s-%s", parsedUrl.EscapedPath(), timestamp, nonce, uid, cdnSignKey)
 	hash := md5.Sum([]byte(signatureString))
 	signature := hex.EncodeToString(hash[:])