diff --git a/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperServiceImpl.java b/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperServiceImpl.java
index 346c01ba..ce509b8d 100644
--- a/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperServiceImpl.java
+++ b/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperServiceImpl.java
@@ -439,11 +439,10 @@ public class PaperServiceImpl extends ServiceImpl<PaperMapper, PaperDO> implemen
         QuestionTypeEnum typeEnum = QuestionTypeEnum.fromCode(question.getQuestionType());
         String typeLabel = typeEnum == null ? question.getQuestionType() : typeEnum.getDesc() + "题";
         String score = question.getScore() == null ? "0" : question.getScore().toPlainString();
-        StringBuilder questionText = new StringBuilder();
-        questionText.append("（").append(typeLabel).append("）")
-                .append(questionNum).append(". ").append(question.getTitle())
-                .append("（题目分值：").append(score).append("）");
-        Paragraph questionLine = new Paragraph(questionText.toString(), new Font(baseFont, 10, Font.NORMAL));
+        String questionText = "（" + typeLabel + "）" +
+                questionNum + ". " + question.getTitle() +
+                "（题目分值：" + score + "）";
+        Paragraph questionLine = new Paragraph(questionText, new Font(baseFont, 10, Font.NORMAL));
         questionLine.setSpacingBefore(8f);
         document.add(questionLine);
         if (CollectionUtils.isEmpty(question.getQuestionOptionVOList())) {