diff --git a/apps/web/src/components/models/course/detail/CourseSyllabus/CourseSyllabus.tsx b/apps/web/src/components/models/course/detail/CourseSyllabus/CourseSyllabus.tsx
index 36eb086..9e6cf84 100755
--- a/apps/web/src/components/models/course/detail/CourseSyllabus/CourseSyllabus.tsx
+++ b/apps/web/src/components/models/course/detail/CourseSyllabus/CourseSyllabus.tsx
@@ -27,7 +27,9 @@ export const CourseSyllabus: React.FC<CourseSyllabusProps> = ({
 	onToggle,
 }) => {
 	const { isHeaderVisible } = useContext(CourseDetailContext);
-	const [expandedSections, setExpandedSections] = useState<string[]>([]);
+	const [expandedSections, setExpandedSections] = useState<string[]>(
+		sections.map((section) => section.id) // 默认展开所有章节
+	);
 	const sectionRefs = useRef<{ [key: string]: HTMLDivElement | null }>({});
 
 	const toggleSection = (sectionId: string) => {