diff --git a/htmltopdf/main.cpp b/htmltopdf/main.cpp
index 8e6bba0e..a5ae99bc 100644
--- a/htmltopdf/main.cpp
+++ b/htmltopdf/main.cpp
@@ -49,11 +49,11 @@ int main(int argc, char *argv[])
     parser.process(QCoreApplication::arguments());
 
     const QStringList requiredArguments = parser.positionalArguments();
-    qInfo() << "Input file:" << requiredArguments.at(0) << "Output PDF:" << requiredArguments.at(1);
     if (requiredArguments.size() != 2) {
         qCritical() << "Invalid number of arguments, expected 2 but got" << requiredArguments.size();
         parser.showHelp(1);
     }
+    qInfo() << "Input file:" << requiredArguments.at(0) << "Output PDF:" << requiredArguments.at(1);
 
     qInfo() << "Creating PDF converter instance";
     HtmltoPdfConverter converter(requiredArguments.at(0), requiredArguments.at(1));
diff --git a/reader/document/Model.cpp b/reader/document/Model.cpp
index f8401564..de20bf40 100755
--- a/reader/document/Model.cpp
+++ b/reader/document/Model.cpp
@@ -107,13 +107,10 @@ deepin_reader::Document *deepin_reader::DocumentFactory::getDocument(const int &
         *pprocess = &decompressor;
         decompressor.setWorkingDirectory(convertedFileDir);
         qCInfo(appLog) << "Unzipping DOCX document:" << targetDoc;
-        QString unzipCommand = "unzip " + targetDoc;
-        qCDebug(appLog) << "执行命令: " << unzipCommand;
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-        decompressor.start(unzipCommand);
-#else
-        decompressor.startCommand(unzipCommand);
-#endif
+        QStringList unzipArgs;
+        unzipArgs << targetDoc;
+        qCDebug(appLog) << "执行命令: unzip" << unzipArgs;
+        decompressor.start("unzip", unzipArgs);
         if (!decompressor.waitForStarted()) {
             qCritical() << "Failed to start unzip process for file:" << targetDoc;
             error = deepin_reader::Document::ConvertFailed;
@@ -151,14 +148,10 @@ deepin_reader::Document *deepin_reader::DocumentFactory::getDocument(const int &
         //     qCDebug(appLog) << "文档" << targetDocFile.fileName() << "不存在！";
         // }
         QString pandocDataDir = prefix + "/share/pandoc/data";
-        QString pandocCommand = QString("pandoc %1 --data-dir=%2 -o %3").arg(targetDoc).arg(pandocDataDir).arg(tmpHtmlFilePath);
-
-        qCDebug(appLog) << "执行命令: " << pandocCommand;
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-        converter.start(pandocCommand);
-#else
-        converter.startCommand(pandocCommand);
-#endif
+        QStringList pandocArgs;
+        pandocArgs << targetDoc << "--data-dir=" + pandocDataDir << "-o" << tmpHtmlFilePath;
+        qCDebug(appLog) << "执行命令: pandoc" << pandocArgs;
+        converter.start("pandoc", pandocArgs);
         if (!converter.waitForStarted()) {
             qCritical() << "Failed to start pandoc conversion process";
             error = deepin_reader::Document::ConvertFailed;
@@ -189,13 +182,10 @@ deepin_reader::Document *deepin_reader::DocumentFactory::getDocument(const int &
         converter2.setWorkingDirectory(convertedFileDir + "/word");
         qCInfo(appLog) << "Converting HTML to PDF:" << realFilePath;
 
-        QString htmltopdfCommand = getHtmlToPdfPath() + " " + tmpHtmlFilePath + " " + realFilePath;
-        qCDebug(appLog) << "执行命令: " << htmltopdfCommand;
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-        converter2.start(htmltopdfCommand);
-#else
-        converter2.startCommand(htmltopdfCommand);
-#endif
+        QStringList htmltopdfArgs;
+        htmltopdfArgs << tmpHtmlFilePath << realFilePath;
+        qCDebug(appLog) << "执行命令:" << getHtmlToPdfPath() << htmltopdfArgs;
+        converter2.start(getHtmlToPdfPath(), htmltopdfArgs);
         if (!converter2.waitForStarted()) {
             qCritical() << "Failed to start htmltopdf conversion process";
             error = deepin_reader::Document::ConvertFailed;
diff --git a/reader/uiframe/DocTabBar.cpp b/reader/uiframe/DocTabBar.cpp
index d4ee8855..9733347a 100644
--- a/reader/uiframe/DocTabBar.cpp
+++ b/reader/uiframe/DocTabBar.cpp
@@ -74,11 +74,11 @@ int DocTabBar::indexOfFilePath(const QString &filePath)
 
 void DocTabBar::insertSheet(DocSheet *sheet, int index)
 {
-    qCDebug(appLog) << "DocTabBar::insertSheet start - inserting sheet:" << sheet->filePath();
     if (sheet == nullptr) {
         qCWarning(appLog) << "Cannot insert null sheet";
         return;
     }
+    qCDebug(appLog) << "DocTabBar::insertSheet start - inserting sheet:" << sheet->filePath();
 
     QString fileName = QFileInfo(sheet->filePath()).fileName();
 
diff --git a/reader/widgets/FindWidget.cpp b/reader/widgets/FindWidget.cpp
index 7246828c..6fd31d0d 100644
--- a/reader/widgets/FindWidget.cpp
+++ b/reader/widgets/FindWidget.cpp
@@ -81,7 +81,9 @@ void FindWidget::onSearchStart()
         qCDebug(appLog) << "searchText != \"\" && m_lastSearchText != searchText";
         m_lastSearchText = searchText;
         setEditAlert(0);
-        m_docSheet->startSearch(searchText);
+        if (m_docSheet) {
+            m_docSheet->startSearch(searchText);
+        }
         m_findPrevButton->setDisabled(false);
         m_findNextButton->setDisabled(false);
     }