diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/port/GasPortUtils.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/port/GasPortUtils.kt
index 5efec46..448cf77 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/port/GasPortUtils.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/port/GasPortUtils.kt
@@ -11,7 +11,7 @@ object GasPortUtils {
     private const val PORT_PATH = "/dev/ttyS6"
     const val FULL_MSG_SIZE = 25
     const val CHECK_TIME = 10000L
-    private const val READ_MSG_INTERVAL = 300L
+    private const val READ_MSG_INTERVAL = 200L
     private var mInitFlag = false
     private var readGasMsgThread: Thread? = null;
 
diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt
index e9dab14..44b340d 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt
@@ -126,22 +126,22 @@ object ParseHelper {
     }
 
     private val overlayBuilder: StringBuilder = java.lang.StringBuilder()
-    private var lastTipTime = -1L
     private fun setOverlayData() {
+        if (gasMap.size < 4) {
+            return
+        }
         val currentTimeMillis = System.currentTimeMillis()
-        if (currentTimeMillis - lastTipTime > 1000) {
-            lastTipTime = currentTimeMillis
-            overlayBuilder.clear()
-            gasMap.forEach { item ->
-                val gas = item.value
-                val time = gas.time
-                // 3S内的数据我们认为有效
-                if (currentTimeMillis - time <= 3000) {
-                    overlayBuilder.append("${gas.gasName}: ${gas.gasValue} ${gas.unit}").append("@")
-                }
+        overlayBuilder.clear()
+        gasMap.forEach { item ->
+            val gas = item.value
+            val time = gas.time
+            // 3S内的数据我们认为有效
+            if (currentTimeMillis - time <= 3000) {
+                overlayBuilder.append("${gas.gasName}: ${gas.gasValue} ${gas.unit}").append("@")
             }
-            TxtOverlay.setShowTip(overlayBuilder.toString())
         }
+        TxtOverlay.setShowTip(overlayBuilder.toString())
+        gasMap.clear()
     }
 
     /**