diff --git a/app/src/main/java/com/example/deviceagent/InfoActivity.kt b/app/src/main/java/com/example/deviceagent/InfoActivity.kt
index 769c06e..93bcc0a 100644
--- a/app/src/main/java/com/example/deviceagent/InfoActivity.kt
+++ b/app/src/main/java/com/example/deviceagent/InfoActivity.kt
@@ -87,7 +87,7 @@ class InfoActivity : Activity() {
             "序列号  $serial",
             "平台    $server",
             "指纹    ${Prefs.fingerprint(this)}",
-            "Agent   v${Prefs.AGENT_VERSION}"
+            "Agent   v${Prefs.agentVersion(this)}"
         ).filter { it.substringAfter("  ").trim().isNotEmpty() }.joinToString("\n")
         tvTime.text = "更新于 " + SimpleDateFormat("HH:mm:ss", Locale.CHINA).format(Date())
     }
diff --git a/app/src/main/java/com/example/deviceagent/PingActivity.kt b/app/src/main/java/com/example/deviceagent/PingActivity.kt
index 7bb84a2..65c8ca9 100644
--- a/app/src/main/java/com/example/deviceagent/PingActivity.kt
+++ b/app/src/main/java/com/example/deviceagent/PingActivity.kt
@@ -24,7 +24,7 @@ class PingActivity : Activity() {
         super.onCreate(savedInstanceState)
         val info = JSONObject().apply {
             put("package", packageName)
-            put("agent_version", Prefs.AGENT_VERSION)
+            put("agent_version", Prefs.agentVersion(this@PingActivity))
             put("agent_api_version", Prefs.API_VERSION)
             put("fingerprint", Prefs.fingerprint(this@PingActivity))
             put("local_ip", Prefs.localIp())
diff --git a/app/src/main/java/com/example/deviceagent/Prefs.kt b/app/src/main/java/com/example/deviceagent/Prefs.kt
index c5d45eb..71c8271 100644
--- a/app/src/main/java/com/example/deviceagent/Prefs.kt
+++ b/app/src/main/java/com/example/deviceagent/Prefs.kt
@@ -11,8 +11,17 @@ import java.io.BufferedReader
  *       --es server http://192.168.20.220:18050 --es token <令牌>
  */
 object Prefs {
-    /** Agent 自身版本，与平台侧 doc/DEVICE_AGENT.md 的契约版本对齐 */
-    const val AGENT_VERSION = "1.0"
+    /**
+     * Agent 自身版本：**直接读包信息**，不要手工维护常量
+     * （实测踩过：版本升到 1.4 了，自检里还写着 1.0——常量忘了改）。
+     */
+    fun agentVersion(ctx: Context): String = try {
+        ctx.packageManager.getPackageInfo(ctx.packageName, 0).versionName ?: "?"
+    } catch (e: Exception) {
+        "?"
+    }
+
+    /** 与平台 doc/DEVICE_AGENT.md 契约里的 agent_api_version 对齐 */
     const val API_VERSION = 1
 
     private const val FILE = "device_agent"