diff --git a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/MainActivity.kt b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/MainActivity.kt
index 57c64fa..3022384 100644
--- a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/MainActivity.kt
+++ b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/MainActivity.kt
@@ -24,6 +24,7 @@ import com.zhushenwudi.lovelivemusicplayer.native.platform.AndroidShareBridge
 import com.zhushenwudi.lovelivemusicplayer.native.platform.AndroidDesktopLyricController
 import com.zhushenwudi.lovelivemusicplayer.native.platform.installAndroidPlatformServices
 import com.zhushenwudi.lovelivemusicplayer.native.util.AppUtils
+import com.zhushenwudi.lovelivemusicplayer.native.util.applyScreenOrientationPolicy
 import com.zhushenwudi.lovelivemusicplayer.platform.AndroidUiHost
 import com.zhushenwudi.lovelivemusicplayer.platform.PlatformServices
 import com.zhushenwudi.lovelivemusicplayer.platform.initAndroidFileSystem
@@ -36,6 +37,7 @@ class MainActivity : ComponentActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        applyScreenOrientationPolicy()
         enableEdgeToEdge()
         AndroidUiHost.activity = this
         initAndroidFileSystem(applicationContext)
diff --git a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/QrScanActivity.kt b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/QrScanActivity.kt
index 0020e5c..35c47cb 100644
--- a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/QrScanActivity.kt
+++ b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/QrScanActivity.kt
@@ -5,6 +5,8 @@ import androidx.activity.ComponentActivity
 import com.journeyapps.barcodescanner.ScanContract
 import com.journeyapps.barcodescanner.ScanOptions
 import com.zhushenwudi.lovelivemusicplayer.i18n.I18n
+import com.zhushenwudi.lovelivemusicplayer.native.util.applyScreenOrientationPolicy
+import com.zhushenwudi.lovelivemusicplayer.native.util.isLargeScreenDevice
 import com.zhushenwudi.lovelivemusicplayer.platform.AndroidUiHost
 
 class QrScanActivity : ComponentActivity() {
@@ -22,11 +24,12 @@ class QrScanActivity : ComponentActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        applyScreenOrientationPolicy()
         val options = ScanOptions().apply {
             setDesiredBarcodeFormats(ScanOptions.QR_CODE)
             setPrompt(I18n.t("scan_qr_prompt"))
             setBeepEnabled(false)
-            setOrientationLocked(false)
+            setOrientationLocked(!isLargeScreenDevice())
             setCaptureActivity(com.journeyapps.barcodescanner.CaptureActivity::class.java)
         }
         barcodeLauncher.launch(options)
diff --git a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/WebViewActivity.kt b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/WebViewActivity.kt
index ab796c2..ddc35f6 100644
--- a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/WebViewActivity.kt
+++ b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/WebViewActivity.kt
@@ -42,6 +42,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.view.WindowCompat
 import com.zhushenwudi.lovelivemusicplayer.i18n.tr
+import com.zhushenwudi.lovelivemusicplayer.native.util.applyScreenOrientationPolicy
 import com.zhushenwudi.lovelivemusicplayer.platform.WebViewAdBlock
 import java.io.ByteArrayInputStream
 import kotlinx.coroutines.delay
@@ -56,6 +57,7 @@ class WebViewActivity : ComponentActivity() {
     @SuppressLint("SetJavaScriptEnabled")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        applyScreenOrientationPolicy()
         WindowCompat.setDecorFitsSystemWindows(window, false)
         val url = intent.getStringExtra(EXTRA_URL).orEmpty()
         val title = intent.getStringExtra(EXTRA_TITLE)
diff --git a/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/util/ScreenOrientationPolicy.kt b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/util/ScreenOrientationPolicy.kt
new file mode 100644
index 0000000..02e8749
--- /dev/null
+++ b/androidApp/src/main/kotlin/com/zhushenwudi/lovelivemusicplayer/native/util/ScreenOrientationPolicy.kt
@@ -0,0 +1,24 @@
+package com.zhushenwudi.lovelivemusicplayer.native.util
+
+import android.app.Activity
+import android.content.pm.ActivityInfo
+
+private const val LARGE_SCREEN_MIN_SMALLEST_WIDTH_DP = 600
+
+/** 手机固定竖屏；平板和展开后达到大屏阈值的设备遵循系统旋转设置。 */
+fun Activity.applyScreenOrientationPolicy() {
+    val isLargeScreen = resources.configuration.smallestScreenWidthDp >=
+        LARGE_SCREEN_MIN_SMALLEST_WIDTH_DP
+    val targetOrientation = if (isLargeScreen) {
+        ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
+    } else {
+        ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+    }
+    if (requestedOrientation != targetOrientation) {
+        requestedOrientation = targetOrientation
+    }
+}
+
+/** 扫码组件使用同一设备分类，避免手机进入扫码页后重新开放旋转。 */
+fun Activity.isLargeScreenDevice(): Boolean =
+    resources.configuration.smallestScreenWidthDp >= LARGE_SCREEN_MIN_SMALLEST_WIDTH_DP
diff --git a/iosApp/iosApp/Info.plist b/iosApp/iosApp/Info.plist
index 621dbe4..369443d 100644
--- a/iosApp/iosApp/Info.plist
+++ b/iosApp/iosApp/Info.plist
@@ -167,8 +167,6 @@
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
 	</array>
 	<key>UISupportedInterfaceOrientations~ipad</key>
 	<array>
diff --git a/iosApp/project.yml b/iosApp/project.yml
index 7dbe43b..3a6065d 100644
--- a/iosApp/project.yml
+++ b/iosApp/project.yml
@@ -85,8 +85,6 @@ targets:
           - remote-notification
         UISupportedInterfaceOrientations:
           - UIInterfaceOrientationPortrait
-          - UIInterfaceOrientationLandscapeLeft
-          - UIInterfaceOrientationLandscapeRight
         "UISupportedInterfaceOrientations~ipad":
           - UIInterfaceOrientationPortrait
           - UIInterfaceOrientationLandscapeLeft