diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChartActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChartActivity.kt
index b2214ca..afc2d05 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChartActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChartActivity.kt
@@ -23,7 +23,7 @@ class ChartActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String {
-        return getString(R.string.chart)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChooseParamsActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChooseParamsActivity.kt
index 1ad1d1d..7bf6cbd 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChooseParamsActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/ChooseParamsActivity.kt
@@ -47,7 +47,7 @@ class ChooseParamsActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.modify_params)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/CloudActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/CloudActivity.kt
index a451123..e086415 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/CloudActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/CloudActivity.kt
@@ -36,7 +36,7 @@ class CloudActivity : NoOptionsActivity() {
     private var uploadingVideo = AtomicBoolean(false)
 
     override fun getTopBarTitle(): String {
-        return getString(R.string.cloud)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/GasListActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/GasListActivity.kt
index fc2840c..a2a7df4 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/GasListActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/GasListActivity.kt
@@ -19,7 +19,7 @@ class GasListActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.gas_list)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/HistoryVideoActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/HistoryVideoActivity.kt
index 772ab62..d087e51 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/HistoryVideoActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/HistoryVideoActivity.kt
@@ -54,7 +54,7 @@ class HistoryVideoActivity : BaseActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.history_video)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/LightSettingActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/LightSettingActivity.kt
index 5e6116d..40b0190 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/LightSettingActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/LightSettingActivity.kt
@@ -15,7 +15,7 @@ class LightSettingActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.light_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/NetSettingActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/NetSettingActivity.kt
index b19595a..f345110 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/NetSettingActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/NetSettingActivity.kt
@@ -21,7 +21,7 @@ class NetSettingActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.net_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/QueryDataActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/QueryDataActivity.kt
index 7709424..8d6baaa 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/QueryDataActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/QueryDataActivity.kt
@@ -60,7 +60,7 @@ class QueryDataActivity : BaseActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.query)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorActivity.kt
index 299d612..b164d51 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorActivity.kt
@@ -23,7 +23,7 @@ class SensorActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.sensor)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorSettingActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorSettingActivity.kt
index e8050ab..06b6d42 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorSettingActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorSettingActivity.kt
@@ -27,7 +27,7 @@ class SensorSettingActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.sensor_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorThresholdSetActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorThresholdSetActivity.kt
index 4a678be..affa2ce 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorThresholdSetActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SensorThresholdSetActivity.kt
@@ -20,7 +20,7 @@ class SensorThresholdSetActivity : NoOptionsActivity() {
     var gasName = ""
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.sensor_threshold_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SettingActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SettingActivity.kt
index f7a639c..3e35b13 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SettingActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/SettingActivity.kt
@@ -22,7 +22,7 @@ class SettingActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
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 498a869..0aacf6d 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
@@ -16,7 +16,7 @@ class SpeedSettingActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.speed_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/TimeSettingActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/TimeSettingActivity.kt
index e7d7e1e..f7c6769 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/TimeSettingActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/TimeSettingActivity.kt
@@ -24,7 +24,7 @@ class TimeSettingActivity : NoOptionsActivity() {
     private var changeTime = -1L;
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.time_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/WarnDataActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/WarnDataActivity.kt
index 4fd2194..23138fa 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/WarnDataActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/ui/WarnDataActivity.kt
@@ -41,7 +41,7 @@ class WarnDataActivity : BaseActivity() {
     }
 
     override fun getTopBarTitle(): String? {
-        return getString(R.string.warn_data)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/wifi/ui/GlobalMonitorActivity.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/wifi/ui/GlobalMonitorActivity.kt
index 3b45a56..3d669a2 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/wifi/ui/GlobalMonitorActivity.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/wifi/ui/GlobalMonitorActivity.kt
@@ -261,7 +261,7 @@ class GlobalMonitorActivity : NoOptionsActivity() {
     }
 
     override fun getTopBarTitle(): String {
-        return getString(R.string.wifi_setting)
+        return getString(R.string.back)
     }
 
     override fun generateContentView(): View {
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 067fd35..55f3076 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,5 +1,6 @@
 <resources>
     <string name="app_name">Watcher</string>
+    <string name="back">返回</string>
     <string name="setting">设置</string>
     <string name="query">数据查询</string>
     <string name="wraning">报警记录</string>