diff --git a/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt b/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
index 4d3f9c1..7290218 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
@@ -32,7 +32,7 @@
     this.axisLeft.setDrawGridLines(false) //设置x轴上每个点对应的线
     this.axisLeft.setDrawZeroLine(true)
     //添加限制线
-    val threshold = SaveKeyValues.getValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, 2)
+    val threshold = SaveKeyValues.getValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, 2.00f)
     val limitLine = LimitLine(threshold.toString().toFloat(), "阈值：${threshold}%LEL")
     limitLine.lineWidth = 1f
     limitLine.lineColor = Color.RED
@@ -61,7 +61,7 @@
 }
 
 fun LineChart.updateLimitLine(threshold: Float) {
-    val limitLine = LimitLine(threshold, "阈值：${threshold}%VOL")
+    val limitLine = LimitLine(threshold, "阈值：${threshold}%LEL")
     limitLine.lineWidth = 1f
     limitLine.lineColor = Color.RED
     //允许在虚线模式下绘制(线段长度，分隔长度，偏移量)

diff --git a/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt b/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
index 4d3f9c1..7290218 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
@@ -32,7 +32,7 @@
     this.axisLeft.setDrawGridLines(false) //设置x轴上每个点对应的线
     this.axisLeft.setDrawZeroLine(true)
     //添加限制线
-    val threshold = SaveKeyValues.getValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, 2)
+    val threshold = SaveKeyValues.getValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, 2.00f)
     val limitLine = LimitLine(threshold.toString().toFloat(), "阈值：${threshold}%LEL")
     limitLine.lineWidth = 1f
     limitLine.lineColor = Color.RED
@@ -61,7 +61,7 @@
 }
 
 fun LineChart.updateLimitLine(threshold: Float) {
-    val limitLine = LimitLine(threshold, "阈值：${threshold}%VOL")
+    val limitLine = LimitLine(threshold, "阈值：${threshold}%LEL")
     limitLine.lineWidth = 1f
     limitLine.lineColor = Color.RED
     //允许在虚线模式下绘制(线段长度，分隔长度，偏移量)
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 0bfdbb9..3c0fb7f 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
@@ -132,7 +132,7 @@
                 SocketConnectionService.weakReferenceHandler ?: return@setOnClickListener
             val message = weakReferenceHandler.obtainMessage()
             message.what = LocaleConstant.UPDATE_GAS_THRESHOLD_CODE
-            //用户使用【%VOL】，但是单片机只能设置【ppm·m】，所以需要转换一下
+            //用户使用【%LEL】，但是单片机只能设置【ppm·m】，所以需要转换一下
             message.obj = (threshold * 10000).toInt()
             weakReferenceHandler.sendMessage(message)
         }
@@ -157,7 +157,10 @@
                 isGetThreshold = true
                 val ppm = msg.obj as Long
                 val threshold = "%.2f".format(ppm / 10000f)
-                SaveKeyValues.putValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold)
+                SaveKeyValues.putValue(
+                    LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold.toFloat()
+                )
+                binding.thresholdView.setText(threshold)
                 binding.lineChart.updateLimitLine(ppm / 10000f)
             }
 
@@ -190,20 +193,20 @@
                 //通常，对于气体在空气中的浓度，我们可以认为100000ppm大约等于200%LEL
                 val formatValue = "%.2f".format(ppm / 500f)
                 binding.currentGasValueView.text = "当前燃气浓度：${formatValue}%LEL"
-                if (ppm > binding.thresholdView.text.toString().toFloat() * 500) {
-                    binding.currentGasValueView.setTextColor(Color.RED)
-                    binding.currentGasValueView.typeface = Typeface.DEFAULT_BOLD
-                } else {
-                    binding.currentGasValueView.setTextColor(Color.BLACK)
-                    binding.currentGasValueView.typeface = Typeface.DEFAULT
+                if (!binding.thresholdView.text.isNullOrBlank()) {
+                    if (ppm > binding.thresholdView.text.toString().toFloat() * 500) {
+                        binding.currentGasValueView.setTextColor(Color.RED)
+                        binding.currentGasValueView.typeface = Typeface.DEFAULT_BOLD
+                    } else {
+                        binding.currentGasValueView.setTextColor(Color.BLACK)
+                        binding.currentGasValueView.typeface = Typeface.DEFAULT
+                    }
                 }
 
                 //折线图添加数据
                 xAxisLabels.add(System.currentTimeMillis().timestampToTime())
                 //浓度线
-                strengthEntries.add(
-                    Entry(i++.toFloat(), formatValue.toFloat(), "浓度")
-                )
+                strengthEntries.add(Entry(i++.toFloat(), formatValue.toFloat(), "浓度"))
                 //设置数据
                 dataSet.values = strengthEntries
                 lineDataSets.add(dataSet)

diff --git a/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt b/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
index 4d3f9c1..7290218 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/extensions/LineChart.kt
@@ -32,7 +32,7 @@
     this.axisLeft.setDrawGridLines(false) //设置x轴上每个点对应的线
     this.axisLeft.setDrawZeroLine(true)
     //添加限制线
-    val threshold = SaveKeyValues.getValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, 2)
+    val threshold = SaveKeyValues.getValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, 2.00f)
     val limitLine = LimitLine(threshold.toString().toFloat(), "阈值：${threshold}%LEL")
     limitLine.lineWidth = 1f
     limitLine.lineColor = Color.RED
@@ -61,7 +61,7 @@
 }
 
 fun LineChart.updateLimitLine(threshold: Float) {
-    val limitLine = LimitLine(threshold, "阈值：${threshold}%VOL")
+    val limitLine = LimitLine(threshold, "阈值：${threshold}%LEL")
     limitLine.lineWidth = 1f
     limitLine.lineColor = Color.RED
     //允许在虚线模式下绘制(线段长度，分隔长度，偏移量)
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 0bfdbb9..3c0fb7f 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
@@ -132,7 +132,7 @@
                 SocketConnectionService.weakReferenceHandler ?: return@setOnClickListener
             val message = weakReferenceHandler.obtainMessage()
             message.what = LocaleConstant.UPDATE_GAS_THRESHOLD_CODE
-            //用户使用【%VOL】，但是单片机只能设置【ppm·m】，所以需要转换一下
+            //用户使用【%LEL】，但是单片机只能设置【ppm·m】，所以需要转换一下
             message.obj = (threshold * 10000).toInt()
             weakReferenceHandler.sendMessage(message)
         }
@@ -157,7 +157,10 @@
                 isGetThreshold = true
                 val ppm = msg.obj as Long
                 val threshold = "%.2f".format(ppm / 10000f)
-                SaveKeyValues.putValue(LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold)
+                SaveKeyValues.putValue(
+                    LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold.toFloat()
+                )
+                binding.thresholdView.setText(threshold)
                 binding.lineChart.updateLimitLine(ppm / 10000f)
             }
 
@@ -190,20 +193,20 @@
                 //通常，对于气体在空气中的浓度，我们可以认为100000ppm大约等于200%LEL
                 val formatValue = "%.2f".format(ppm / 500f)
                 binding.currentGasValueView.text = "当前燃气浓度：${formatValue}%LEL"
-                if (ppm > binding.thresholdView.text.toString().toFloat() * 500) {
-                    binding.currentGasValueView.setTextColor(Color.RED)
-                    binding.currentGasValueView.typeface = Typeface.DEFAULT_BOLD
-                } else {
-                    binding.currentGasValueView.setTextColor(Color.BLACK)
-                    binding.currentGasValueView.typeface = Typeface.DEFAULT
+                if (!binding.thresholdView.text.isNullOrBlank()) {
+                    if (ppm > binding.thresholdView.text.toString().toFloat() * 500) {
+                        binding.currentGasValueView.setTextColor(Color.RED)
+                        binding.currentGasValueView.typeface = Typeface.DEFAULT_BOLD
+                    } else {
+                        binding.currentGasValueView.setTextColor(Color.BLACK)
+                        binding.currentGasValueView.typeface = Typeface.DEFAULT
+                    }
                 }
 
                 //折线图添加数据
                 xAxisLabels.add(System.currentTimeMillis().timestampToTime())
                 //浓度线
-                strengthEntries.add(
-                    Entry(i++.toFloat(), formatValue.toFloat(), "浓度")
-                )
+                strengthEntries.add(Entry(i++.toFloat(), formatValue.toFloat(), "浓度"))
                 //设置数据
                 dataSet.values = strengthEntries
                 lineDataSets.add(dataSet)
diff --git a/app/src/main/java/com/casic/app/safetreecontroller/widgets/LineChartMarkerView.kt b/app/src/main/java/com/casic/app/safetreecontroller/widgets/LineChartMarkerView.kt
index 50d1040..26cb255 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/widgets/LineChartMarkerView.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/widgets/LineChartMarkerView.kt
@@ -41,7 +41,7 @@
         super.refreshContent(e, highlight)
         try {
             timeView.text = xAxisDate[(e.x).toInt()]
-            valueView.text = "${"%.2f".format(e.y)}% VOL"
+            valueView.text = "${"%.2f".format(e.y)}%LEL"
         } catch (ex: Exception) {
             ex.printStackTrace()
         }