diff --git a/src/utils/common.ts b/src/utils/common.ts
new file mode 100644
index 0000000..cc20522
--- /dev/null
+++ b/src/utils/common.ts
@@ -0,0 +1,13 @@
+import { MainPostTag, MainPostTagParent, MainPostTagName } from '@/types/common';
+
+export const getTagsByMainTag:(main:string)=>Map<string, number> = (main:string)=>{
+    const ans = new Map<string, number>()
+    const mainTagId = MainPostTag[main as keyof typeof MainPostTag];
+    for(const key in MainPostTagParent){
+        if(MainPostTagParent[key] === mainTagId)
+        {
+            ans.set(MainPostTagName[key], Number(key));
+        }
+    }
+    return ans;
+}
\ No newline at end of file