diff --git a/.changeset/brown-poems-accept.md b/.changeset/brown-poems-accept.md
new file mode 100644
index 000000000..3fd772063
--- /dev/null
+++ b/.changeset/brown-poems-accept.md
@@ -0,0 +1,5 @@
+---
+"@hi-ui/hiui": patch
+---
+
+fix(dropdown): 修复 overlay={{className: 'xx'}} 不生效问题
diff --git a/.changeset/quick-seas-allow.md b/.changeset/quick-seas-allow.md
new file mode 100644
index 000000000..1c62b47d3
--- /dev/null
+++ b/.changeset/quick-seas-allow.md
@@ -0,0 +1,5 @@
+---
+"@hi-ui/dropdown": patch
+---
+
+fix: 修复 overlay={{className: 'xx'}} 不生效问题
diff --git a/packages/ui/dropdown/src/use-dropdown.tsx b/packages/ui/dropdown/src/use-dropdown.tsx
index d0849c4b1..6921878c5 100644
--- a/packages/ui/dropdown/src/use-dropdown.tsx
+++ b/packages/ui/dropdown/src/use-dropdown.tsx
@@ -134,6 +134,7 @@ export const useDropdown = (props: UseDropdownProps) => {
       overlay: {
         ...overlay,
         ...props.overlay,
+        className: props.overlay.className ?? overlay?.className,
         closeOnOutsideClick: true,
         visible: menuVisible,
         attachEl: triggerElementRef.current,