diff --git a/pages/index/index.js b/pages/index/index.js
index 01d1437..2f6443c 100644
--- a/pages/index/index.js
+++ b/pages/index/index.js
@@ -28,6 +28,7 @@ Page({
     planTotal: 7,
     planProgress: 0,
     showPicker: false,
+    pickerInputFocus: false,
     presets: [30, 60, 90, 120, 180, 300],
     customDuration: 60,
     customInput: '',
@@ -170,7 +171,12 @@ Page({
 
   onSelectPreset(e) {
     const val = e.currentTarget.dataset.value
-    this.setData({ customDuration: val, customInput: '' })
+    // 收起键盘(失焦 input),避免清空 customInput 时触发 adjust-position 让页面向上跳
+    this.setData({ pickerInputFocus: false, customDuration: val, customInput: '' })
+  },
+
+  onPickerInputFocus() {
+    this.setData({ pickerInputFocus: true })
   },
 
   onCustomInput(e) {
diff --git a/pages/index/index.wxml b/pages/index/index.wxml
index 67771a5..5ea2220 100644
--- a/pages/index/index.wxml
+++ b/pages/index/index.wxml
@@ -118,7 +118,9 @@
         type="number"
         placeholder="输入秒数"
         value="{{customInput}}"
+        focus="{{pickerInputFocus}}"
         bindinput="onCustomInput"
+        bindfocus="onPickerInputFocus"
       />
       <text class="custom-label">秒</text>
     </view>