diff --git a/app/src/protyle/preview/index.ts b/app/src/protyle/preview/index.ts
index 1546849e5..b9a0a7656 100644
--- a/app/src/protyle/preview/index.ts
+++ b/app/src/protyle/preview/index.ts
@@ -266,6 +266,7 @@ export class Preview {
         } else if (type === "yuque") {
             fetchPost("/api/lute/copyStdMarkdown", {
                 id: protyle.block.rootID,
+                assetsDestSpace2Underscore: true,
             }, (response) => {
                 writeText(response.data);
                 showMessage(`${window.siyuan.languages.pasteToYuque}`);
diff --git a/kernel/api/lute.go b/kernel/api/lute.go
index dea10fc0e..0219172f3 100644
--- a/kernel/api/lute.go
+++ b/kernel/api/lute.go
@@ -44,7 +44,11 @@ func copyStdMarkdown(c *gin.Context) {
 	}
 
 	id := arg["id"].(string)
-	ret.Data = model.ExportStdMarkdown(id)
+	assetsDestSpace2Underscore := false
+	if nil != arg["assetsDestSpace2Underscore"] {
+		assetsDestSpace2Underscore = arg["assetsDestSpace2Underscore"].(bool)
+	}
+	ret.Data = model.ExportStdMarkdown(id, assetsDestSpace2Underscore)
 }
 
 func html2BlockDOM(c *gin.Context) {
diff --git a/kernel/model/export.go b/kernel/model/export.go
index 8554d9281..eda612770 100644
--- a/kernel/model/export.go
+++ b/kernel/model/export.go
@@ -1449,7 +1449,7 @@ func processPDFLinkEmbedAssets(pdfCtx *model.Context, assetDests []string, remov
 	}
 }
 
-func ExportStdMarkdown(id string) string {
+func ExportStdMarkdown(id string, assetsDestSpace2Underscore bool) string {
 	tree, err := LoadTreeByBlockID(id)
 	if err != nil {
 		logging.LogErrorf("load tree by block id [%s] failed: %s", id, err)
@@ -1487,7 +1487,7 @@ func ExportStdMarkdown(id string) string {
 	}
 	defBlockIDs = gulu.Str.RemoveDuplicatedElem(defBlockIDs)
 
-	return exportMarkdownContent0(tree, cloudAssetsBase, false,
+	return exportMarkdownContent0(tree, cloudAssetsBase, assetsDestSpace2Underscore,
 		".md", Conf.Export.BlockRefMode, Conf.Export.BlockEmbedMode, Conf.Export.FileAnnotationRefMode,
 		Conf.Export.TagOpenMarker, Conf.Export.TagCloseMarker,
 		Conf.Export.BlockRefTextLeft, Conf.Export.BlockRefTextRight,