diff --git a/README.md b/README.md
index b237caa..da8736e 100644
--- a/README.md
+++ b/README.md
@@ -172,6 +172,8 @@ import "github.com/duke-git/lancet/v2/compare"
 -   **<big>GreaterOrEqual</big>** : Checks if value `left` less greater or equal than value `right`.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/compare.md#GreaterOrEqual)]
     [[play](https://go.dev/play/p/vx8mP0U8DFk)]
+-   **<big>InDelta</big>** : Checks if two values are equal or not within a delta.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/compare.md#InDelta)]
 
 <h3 id="Concurrency"> 3. Concurrency package contain some functions to support concurrent programming. eg, goroutine, channel, async. &nbsp; &nbsp; &nbsp; &nbsp;<a href="#index">index</span> </h3>
 
diff --git a/README_zh-CN.md b/README_zh-CN.md
index 5603096..9d29ef5 100644
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -171,6 +171,8 @@ import "github.com/duke-git/lancet/v2/compare"
 -   **<big>GreaterOrEqual</big>** : 验证参数`left`的值是否大于或等于参数`right`的值。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/compare_zh-CN.md#GreaterOrEqual)]
     [[play](https://go.dev/play/p/vx8mP0U8DFk)]
+-   **<big>InDelta</big>** : 检查增量内两个值是否相等。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/compare_zh-CN.md#InDelta)]
 
 <h3 id="Concurrency"> 3. concurrency 包含一些支持并发编程的功能。例如：goroutine, channel, async 等。&nbsp; &nbsp; &nbsp; &nbsp;<a href="#index">回到目录</a></h3>
 
diff --git a/docs/compare_zh-CN.md b/docs/compare_zh-CN.md
index 1468906..3cb2ef3 100644
--- a/docs/compare_zh-CN.md
+++ b/docs/compare_zh-CN.md
@@ -30,6 +30,8 @@ import (
 -   [GreaterThan](#GreaterThan)
 -   [LessOrEqual](#LessOrEqual)
 -   [GreaterOrEqual](#GreaterOrEqual)
+-   [InDelta](#InDelta)
+
 
 <div STYLE="page-break-after: always;"></div>
 
@@ -324,3 +326,50 @@ func main() {
     // false
 }
 ```
+
+### <span id="InDelta">InDelta</span>
+
+<p>检查增量内两个值是否相等。</p>
+
+<b>函数签名:</b>
+
+```go
+func InDelta[T constraints.Integer | constraints.Float](left, right T, delta float64) bool
+```
+
+<b>示例:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/v2/compare"
+)
+
+func main() {
+    result1 := InDelta(1, 1, 0)
+    result2 := InDelta(1, 2, 0)
+
+    result3 := InDelta(2.0/3.0, 0.66667, 0.001)
+    result4 := InDelta(2.0/3.0, 0.0, 0.001)
+
+    result5 := InDelta(float64(74.96)-float64(20.48), 54.48, 0)
+    result6 := InDelta(float64(74.96)-float64(20.48), 54.48, 1e-14)
+
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
+
+    // Output:
+    // true
+    // false
+    // true
+    // false
+    // false
+    // true
+}
+```