diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SpeedSettingActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SpeedSettingActivity.kt
index 0aacf6d..1ced509 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SpeedSettingActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SpeedSettingActivity.kt
@@ -8,6 +8,7 @@ import com.yinuo.safetywatcher.R
 import com.yinuo.safetywatcher.databinding.ActivitySpeedSettingBinding
 import com.yinuo.safetywatcher.watcher.base.NoOptionsActivity
 import com.yinuo.safetywatcher.watcher.port.GasPortUtils
+import com.yinuo.safetywatcher.watcher.utils.SpeedUtils
 
 class SpeedSettingActivity : NoOptionsActivity() {
 
@@ -50,9 +51,9 @@ class SpeedSettingActivity : NoOptionsActivity() {
     }
 
     private fun getDefaultSpeed(): Int {
-        var localSpeed = MMKVUtils.getInt("speed")
+        var localSpeed = SpeedUtils.getSpeed()
         if (localSpeed < 0) {
-            localSpeed = 4
+            localSpeed = 0
         }
         return localSpeed
     }
@@ -67,7 +68,7 @@ class SpeedSettingActivity : NoOptionsActivity() {
         } else if (speedProgress > 9) {
             legalSpeed = 9
         }
-        MMKVUtils.put("speed", legalSpeed)
+        SpeedUtils.setSpeed(legalSpeed)
         GasPortUtils.setSpeed(legalSpeed)
     }
 
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/SpeedUtils.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/SpeedUtils.kt
new file mode 100644
index 0000000..7ecfa6f
--- /dev/null
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/SpeedUtils.kt
@@ -0,0 +1,13 @@
+package com.yinuo.safetywatcher.watcher.utils
+
+object SpeedUtils {
+    private var speed = 0
+
+    fun getSpeed(): Int {
+        return speed
+    }
+
+    fun setSpeed(legalSpeed: Int) {
+        this.speed = legalSpeed
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_speed_setting.xml b/app/src/main/res/layout/activity_speed_setting.xml
index 2264b01..7cedc75 100644
--- a/app/src/main/res/layout/activity_speed_setting.xml
+++ b/app/src/main/res/layout/activity_speed_setting.xml
@@ -22,7 +22,7 @@
             android:max="9"
             android:min="0"
             android:padding="0dp"
-            android:progress="4" />
+            android:progress="0" />
 
         <TextView
             android:id="@+id/tv_speed"