diff --git a/app/src/protyle/export/index.ts b/app/src/protyle/export/index.ts
index 1b9e071c6..5340bcebb 100644
--- a/app/src/protyle/export/index.ts
+++ b/app/src/protyle/export/index.ts
@@ -72,6 +72,11 @@ const renderPDF = (id: string) => {
         keepFold: false,
     }));
     const servePath = window.location.protocol + "//" + window.location.host;
+    const isDefault = (window.siyuan.config.appearance.mode === 1 && window.siyuan.config.appearance.themeDark === "midnight") || (window.siyuan.config.appearance.mode === 0 && window.siyuan.config.appearance.themeLight === "daylight")
+    let themeStyle = "";
+    if (!isDefault) {
+        themeStyle = `<link rel="stylesheet" type="text/css" id="themeStyle" href="${servePath}/appearance/themes/${window.siyuan.config.appearance.themeLight}/${window.siyuan.config.appearance.customCSS ? "custom" : "theme"}.css?${Constants.SIYUAN_VERSION}"/>`
+    }
     const html = `<!DOCTYPE html><html>
 <head>
     <meta charset="utf-8">
@@ -81,8 +86,8 @@ const renderPDF = (id: string) => {
     <meta name="mobile-web-app-capable" content="yes"/>
     <meta name="apple-mobile-web-app-status-bar-style" content="black">
     <link rel="stylesheet" type="text/css" id="baseStyle" href="${servePath}/stage/build/export/base.css?${Constants.SIYUAN_VERSION}"/>
-    <link rel="stylesheet" type="text/css" id="themeDefaultStyle" href="${servePath}/appearance/themes/daylight/theme.css?${Constants.SIYUAN_VERSION}"/>
-    <link rel="stylesheet" type="text/css" id="themeStyle" href="${servePath}/appearance/themes/${window.siyuan.config.appearance.themeLight}/${window.siyuan.config.appearance.customCSS ? "custom" : "theme"}.css?${Constants.SIYUAN_VERSION}"/>
+    <link rel="stylesheet" type="text/css" id="themeDefaultStyle" href="${servePath}/appearance/themes/daylight/${(window.siyuan.config.appearance.customCSS && isDefault) ? "custom" : "theme"}.css?${Constants.SIYUAN_VERSION}"/>
+    ${themeStyle}
     <title>${window.siyuan.languages.export} PDF</title>
     <style>
         body {
@@ -479,7 +484,11 @@ const onExport = (data: IWebSocketData, filePath: string, type: string, removeAs
         themeName = window.siyuan.config.appearance.themeDark;
         mode = 1;
     }
-
+    const isDefault = (window.siyuan.config.appearance.mode === 1 && window.siyuan.config.appearance.themeDark === "midnight") || (window.siyuan.config.appearance.mode === 0 && window.siyuan.config.appearance.themeLight === "daylight")
+    let themeStyle = "";
+    if (!isDefault) {
+        themeStyle = `<link rel="stylesheet" type="text/css" id="themeStyle" href="appearance/themes/${themeName}/${window.siyuan.config.appearance.customCSS ? "custom" : "theme"}.css?${Constants.SIYUAN_VERSION}"/>`
+    }
     const html = `<!DOCTYPE html><html>
 <head>
     <meta charset="utf-8">
@@ -489,8 +498,8 @@ const onExport = (data: IWebSocketData, filePath: string, type: string, removeAs
     <meta name="mobile-web-app-capable" content="yes"/>
     <meta name="apple-mobile-web-app-status-bar-style" content="black">
     <link rel="stylesheet" type="text/css" id="baseStyle" href="stage/build/export/base.css?${Constants.SIYUAN_VERSION}"/>
-    <link rel="stylesheet" type="text/css" id="themeDefaultStyle" href="appearance/themes/daylight/theme.css?${Constants.SIYUAN_VERSION}"/>
-    <link rel="stylesheet" type="text/css" id="themeStyle" href="appearance/themes/${themeName}/${window.siyuan.config.appearance.customCSS ? "custom" : "theme"}.css?${Constants.SIYUAN_VERSION}"/>
+    <link rel="stylesheet" type="text/css" id="themeDefaultStyle" href="appearance/themes/${themeName}/${(window.siyuan.config.appearance.customCSS && isDefault) ? "custom" : "theme"}.css?${Constants.SIYUAN_VERSION}"/>
+    ${themeStyle}
     <title>${pathPosix().basename(filePath)} - ${window.siyuan.languages.siyuanNote}  v${Constants.SIYUAN_VERSION}</title>
     <style>
         body {background-color: var(--b3-theme-background);color: var(--b3-theme-on-background)}
