diff --git a/lib/core/pinyin/handle.ts b/lib/core/pinyin/handle.ts
index 01a352b..3150aec 100644
--- a/lib/core/pinyin/handle.ts
+++ b/lib/core/pinyin/handle.ts
@@ -13,6 +13,7 @@ import { SingleWordResult } from "../../common/type";
 import type { SurnameMode } from "../../common/type";
 import { acTree, MatchPattern, TokenizationAlgorithm } from "../../common/segmentit";
 import {
+  DoubleUnicodeCharReg,
   Priority,
 } from "@/common/constant";
 import { splitString } from "@/common/utils";
@@ -275,12 +276,12 @@ const getPinyinWithNum: GetPinyinWithNum = (pinyin, originPinyin) => {
  * @param {string} pinyin
  * @return {string}
  */
-type GetFirstLetter = (pinyin: string) => string;
-const getFirstLetter: GetFirstLetter = (pinyin) => {
+type GetFirstLetter = (pinyin: string, isZh: boolean) => string;
+const getFirstLetter: GetFirstLetter = (pinyin: string, isZh: boolean) => {
   const first_letter_arr: string[] = [];
   const pinyin_arr = pinyin.split(" ");
   pinyin_arr.forEach((pinyin) => {
-    first_letter_arr.push(pinyin[0]);
+    first_letter_arr.push(isZh ? pinyin[0] : pinyin);
   });
   return first_letter_arr.join(" ");
 };
diff --git a/lib/core/pinyin/middlewares.ts b/lib/core/pinyin/middlewares.ts
index 6adc745..97bbcd5 100644
--- a/lib/core/pinyin/middlewares.ts
+++ b/lib/core/pinyin/middlewares.ts
@@ -95,7 +95,7 @@ export const middlewarePattern = (
       break;
     case "first":
       list.forEach((item) => {
-        item.result = getFirstLetter(item.result);
+        item.result = getFirstLetter(item.result, item.isZh);
       });
       break;
     case "finalHead":
@@ -198,7 +198,7 @@ export const middlewareType = (
         pinyin,
         initial,
         final,
-        first: getFirstLetter(item.result),
+        first: getFirstLetter(item.result, item.isZh),
         finalHead: head,
         finalBody: body,
         finalTail: tail,
diff --git a/lib/core/polyphonic/index.ts b/lib/core/polyphonic/index.ts
index d0fe881..1dcc245 100644
--- a/lib/core/polyphonic/index.ts
+++ b/lib/core/polyphonic/index.ts
@@ -249,7 +249,7 @@ export const handleType = (
         pinyin,
         initial,
         final,
-        first: getFirstLetter(item.result),
+        first: getFirstLetter(item.result, item.isZh),
         finalHead: head,
         finalBody: body,
         finalTail: tail,
diff --git a/test/all.test.js b/test/all.test.js
index 688c540..eb74bed 100644
--- a/test/all.test.js
+++ b/test/all.test.js
@@ -99,7 +99,7 @@ describe('all', () => {
         pinyin: '',
         initial: '',
         final: '',
-        first: '',
+        first: 'a',
         finalHead: '',
         finalBody: '',
         finalTail: '',
@@ -114,7 +114,7 @@ describe('all', () => {
         pinyin: '',
         initial: '',
         final: '',
-        first: '',
+        first: '𧒽',
         finalHead: '',
         finalBody: '',
         finalTail: '',
@@ -207,7 +207,7 @@ describe('all', () => {
         pinyin: '',
         initial: '',
         final: '',
-        first: '',
+        first: 'a𧒽',
         finalHead: '',
         finalBody: '',
         finalTail: '',