diff --git a/components/select/index.en-US.md b/components/select/index.en-US.md
index 83d9f928ed..0f7c1ad615 100644
--- a/components/select/index.en-US.md
+++ b/components/select/index.en-US.md
@@ -78,6 +78,7 @@ Select component to select value from options.
 | key | Same usage as `value`. If React request you to set this property, you can set it to value of option, and then omit value property. | string |  |
 | title | `title` of Select after select this Option | string | - |
 | value | default to filter with this property | string\|number | - |
+| className | additional class to option | string | - |
 
 ### OptGroup props
 
diff --git a/components/select/index.tsx b/components/select/index.tsx
index 9bb5d36dd0..bda4c8d966 100755
--- a/components/select/index.tsx
+++ b/components/select/index.tsx
@@ -74,6 +74,8 @@ export interface OptionProps {
   value?: string | number;
   title?: string;
   children?: React.ReactNode;
+  className?: string;
+  key?: string;
 }
 
 export interface OptGroupProps {