diff --git a/CHANGELOG.en-US.md b/CHANGELOG.en-US.md
index 5c2c913c35f..d8423afaf4e 100644
--- a/CHANGELOG.en-US.md
+++ b/CHANGELOG.en-US.md
@@ -15,6 +15,7 @@
 ### Fixes
 
 - `n-select` can't input in filterable mode in single mode in iOS Safari, closes [#230](https://github.com/TuSimple/naive-ui/issues/230)
+- `n-input-number` doesn't change with /- buttons if you delete its content at least once, closes [#251](https://github.com/TuSimple/naive-ui/issues/251)
 
 ## 2.13.0 (2021-06-21)
 
diff --git a/CHANGELOG.zh-CN.md b/CHANGELOG.zh-CN.md
index b0f187996b5..de9e446d88d 100644
--- a/CHANGELOG.zh-CN.md
+++ b/CHANGELOG.zh-CN.md
@@ -15,6 +15,7 @@
 ### Fixes
 
 - `n-select` 在可过滤单选模式下在 iOS Safari 无法输入，关闭 [#230](https://github.com/TuSimple/naive-ui/issues/230)
+- 修复 `n-input-number` 至少删除一次输入框内容，则 input-number 不会随 +/- 按钮更改，关闭 [#251](https://github.com/TuSimple/naive-ui/issues/251)
 
 ## 2.13.0 (2021-06-21)
 
diff --git a/src/input-number/src/utils.ts b/src/input-number/src/utils.ts
index e9ae998b678..b13e232396f 100644
--- a/src/input-number/src/utils.ts
+++ b/src/input-number/src/utils.ts
@@ -1,11 +1,7 @@
 // string => string (expected, not implemented)
 // string => number (legacy)
 export function parse (value: string): number | null {
-  if (
-    value === undefined ||
-    value === null ||
-    (typeof value === 'string' && value.trim() === '')
-  ) {
+  if (value === undefined || value === null) {
     return null
   }
   return Number(value)