diff --git a/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt b/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
index ab4f3ae..49f8d37 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
@@ -156,12 +156,12 @@
             LocaleConstant.QUERY_METHANE_THRESHOLD_RESPONSE_CODE -> {
                 isGetThreshold = true
                 val ppm = msg.obj as Int
-                val threshold = "%.2f".format(ppm / 10000f)
+                val threshold = "%.2f".format(ppm / 500f)
                 SaveKeyValues.putValue(
                     LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold.toFloat()
                 )
                 binding.thresholdView.setText(threshold)
-                binding.lineChart.updateLimitLine(ppm / 10000f)
+                binding.lineChart.updateLimitLine(ppm / 500f)
             }
 
             LocaleConstant.QUERY_CPU_TEMPERATURE_RESPONSE_CODE -> {

diff --git a/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt b/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
index ab4f3ae..49f8d37 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
@@ -156,12 +156,12 @@
             LocaleConstant.QUERY_METHANE_THRESHOLD_RESPONSE_CODE -> {
                 isGetThreshold = true
                 val ppm = msg.obj as Int
-                val threshold = "%.2f".format(ppm / 10000f)
+                val threshold = "%.2f".format(ppm / 500f)
                 SaveKeyValues.putValue(
                     LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold.toFloat()
                 )
                 binding.thresholdView.setText(threshold)
-                binding.lineChart.updateLimitLine(ppm / 10000f)
+                binding.lineChart.updateLimitLine(ppm / 500f)
             }
 
             LocaleConstant.QUERY_CPU_TEMPERATURE_RESPONSE_CODE -> {
diff --git a/app/src/main/res/layout/fragment_methane_monitor.xml b/app/src/main/res/layout/fragment_methane_monitor.xml
index 0867d41..66182bc 100644
--- a/app/src/main/res/layout/fragment_methane_monitor.xml
+++ b/app/src/main/res/layout/fragment_methane_monitor.xml
@@ -72,7 +72,6 @@
                 android:layout_weight="1"
                 android:background="@drawable/bg_solid_layout_white_radius_5"
                 android:inputType="numberDecimal"
-                android:maxLength="4"
                 android:padding="@dimen/dp_5"
                 android:singleLine="true"
                 android:textColor="@color/black"