diff --git a/lib/core/html/index.ts b/lib/core/html/index.ts
index ab17264..138e755 100644
--- a/lib/core/html/index.ts
+++ b/lib/core/html/index.ts
@@ -31,6 +31,12 @@ interface HtmlOptions {
   customClassMap?: {
     [classname: string]: string[];
   };
+  /**
+   * @description 是否对"一"和"不"开启变调。默认开启。参考：https://zh.wiktionary.org/wiki/Appendix:%E2%80%9C%E4%B8%80%E2%80%9D%E5%8F%8A%E2%80%9C%E4%B8%8D%E2%80%9D%E7%9A%84%E5%8F%98%E8%B0%83
+   * @value true：开启
+   * @value false：不开启
+   */
+  inflection?: boolean;
 }
 
 const DefaultHtmlOptions: HtmlOptions = {
@@ -41,6 +47,7 @@ const DefaultHtmlOptions: HtmlOptions = {
   wrapNonChinese: false,
   toneType: 'symbol',
   customClassMap: {},
+  inflection: true,
 };
 
 /**
@@ -57,6 +64,7 @@ export const html = (text: string, options?: HtmlOptions) => {
   const pinyinArray = pinyin(text, {
     type: 'all',
     toneType: completeOptions.toneType,
+    inflection: options?.inflection,
   });
   const result = pinyinArray.map((item) => {
     let additionalClass = '';
diff --git a/lib/core/pinyin/index.ts b/lib/core/pinyin/index.ts
index c4795aa..a973e39 100644
--- a/lib/core/pinyin/index.ts
+++ b/lib/core/pinyin/index.ts
@@ -9,6 +9,7 @@ import {
   middlewareV,
   middlewareType,
   middlewareDoubleUnicode,
+  middlewareInflection,
 } from './middlewares';
 
 interface BasicOptions {
@@ -70,6 +71,12 @@ interface BasicOptions {
    * @value true：返回值中 ü 转换成 v
    */
   v?: boolean;
+  /**
+   * @description 是否对"一"和"不"开启变调。默认开启。参考：https://zh.wiktionary.org/wiki/Appendix:%E2%80%9C%E4%B8%80%E2%80%9D%E5%8F%8A%E2%80%9C%E4%B8%8D%E2%80%9D%E7%9A%84%E5%8F%98%E8%B0%83
+   * @value true：开启
+   * @value false：不开启
+   */
+  inflection?: boolean;
 }
 
 interface AllData {
@@ -143,6 +150,7 @@ const DEFAULT_OPTIONS: CompleteOptions = {
   nonZh: 'spaced',
   v: false,
   separator: ' ',
+  inflection: true,
 };
 
 /**
@@ -207,6 +215,9 @@ function pinyin(
 
   list = getPinyin(word, list, options.mode || 'normal');
 
+  // 一和不变调处理
+  list = middlewareInflection(list, options.inflection as boolean);
+
   // 双 unicode 编码字符处理
   list = middlewareDoubleUnicode(list);
 
diff --git a/lib/core/pinyin/middlewares.ts b/lib/core/pinyin/middlewares.ts
index 887df5d..b1a4f63 100644
--- a/lib/core/pinyin/middlewares.ts
+++ b/lib/core/pinyin/middlewares.ts
@@ -222,3 +222,20 @@ export const middlewareDoubleUnicode = (
   });
   return list;
 };
+
+// 是否开启变调
+export const middlewareInflection = (
+  list: SingleWordResult[],
+  inflection: boolean,
+): SingleWordResult[] => {
+  if (inflection === false) {
+    list.forEach(item => {
+      if (item.origin === '一') {
+        item.result = item.originPinyin = 'yī';
+      } else if (item.origin === '不') {
+        item.result = item.originPinyin = 'bù';
+      }
+    })
+  }
+  return list;
+};
diff --git a/test/special.test.js b/test/special.test.js
index eb75616..bcdd8f9 100644
--- a/test/special.test.js
+++ b/test/special.test.js
@@ -19,7 +19,7 @@ describe('number', () => {
 
   it('[number]数字发音 一行人', () => {
     const result = pinyin('一行人');
-    expect(result).to.be.equal('yī xíng rén');
+    expect(result).to.be.equal('yì xíng rén');
   });
 
   it('[number]数字发音 二百零一行', () => {
@@ -64,4 +64,9 @@ describe('special change tone', () => {
     const result = pinyin('一会儿');
     expect(result).to.be.equal('yí huì er');
   });
+
+  it('[special change tone]一会儿', () => {
+    const result = pinyin('一会儿', { inflection: false });
+    expect(result).to.be.equal('yī huì er');
+  });
 });
diff --git a/types/core/html/index.d.ts b/types/core/html/index.d.ts
index fa68df6..5419f71 100644
--- a/types/core/html/index.d.ts
+++ b/types/core/html/index.d.ts
@@ -29,6 +29,12 @@ interface HtmlOptions {
     customClassMap?: {
         [classname: string]: string[];
     };
+    /**
+     * @description 是否对"一"和"不"开启变调。默认开启。参考：https://zh.wiktionary.org/wiki/Appendix:%E2%80%9C%E4%B8%80%E2%80%9D%E5%8F%8A%E2%80%9C%E4%B8%8D%E2%80%9D%E7%9A%84%E5%8F%98%E8%B0%83
+     * @value true：开启
+     * @value false：不开启
+     */
+    inflection?: boolean;
 }
 /**
  * @description: 获取带拼音汉字的 html 字符串
diff --git a/types/core/pinyin/index.d.ts b/types/core/pinyin/index.d.ts
index 4e0235f..8be6496 100644
--- a/types/core/pinyin/index.d.ts
+++ b/types/core/pinyin/index.d.ts
@@ -49,6 +49,12 @@ interface BasicOptions {
      * @value true：返回值中 ü 转换成 v
      */
     v?: boolean;
+    /**
+     * @description 是否对"一"和"不"开启变调。默认开启。参考：https://zh.wiktionary.org/wiki/Appendix:%E2%80%9C%E4%B8%80%E2%80%9D%E5%8F%8A%E2%80%9C%E4%B8%8D%E2%80%9D%E7%9A%84%E5%8F%98%E8%B0%83
+     * @value true：开启
+     * @value false：不开启
+     */
+    inflection?: boolean;
 }
 interface AllData {
     origin: string;
diff --git a/types/core/pinyin/middlewares.d.ts b/types/core/pinyin/middlewares.d.ts
index 74285ca..5004ae1 100644
--- a/types/core/pinyin/middlewares.d.ts
+++ b/types/core/pinyin/middlewares.d.ts
@@ -19,3 +19,4 @@ export declare const middlewareType: (list: SingleWordResult[], options: Complet
     isZh: boolean;
 }[];
 export declare const middlewareDoubleUnicode: (list: SingleWordResult[]) => SingleWordResult[];
+export declare const middlewareInflection: (list: SingleWordResult[], inflection: boolean) => SingleWordResult[];