diff --git a/manager/src/main/java/nkbe/util/ShizukuApi.kt b/manager/src/main/java/nkbe/util/ShizukuApi.kt
index 0fe7c3d..472b7b7 100644
--- a/manager/src/main/java/nkbe/util/ShizukuApi.kt
+++ b/manager/src/main/java/nkbe/util/ShizukuApi.kt
@@ -42,6 +42,15 @@ object ShizukuApi {
     var isBinderAvailable = false
     var isPermissionGranted by mutableStateOf(false)
 
+    fun getBackendUidOrNull(): Int? {
+        if (!isBinderAvailable || !isPermissionGranted) return null
+        return runCatching { Shizuku.getUid() }
+            .getOrNull()
+            ?.takeIf { it >= 0 }
+    }
+
+    fun isRootBackend(): Boolean = getBackendUidOrNull() == 0
+
     fun init() {
         Shizuku.addBinderReceivedListenerSticky {
             isBinderAvailable = true
diff --git a/manager/src/main/java/org/lsposed/npatch/ui/page/manage/AppManagePage.kt b/manager/src/main/java/org/lsposed/npatch/ui/page/manage/AppManagePage.kt
index f9e5e79..b98a2b4 100644
--- a/manager/src/main/java/org/lsposed/npatch/ui/page/manage/AppManagePage.kt
+++ b/manager/src/main/java/org/lsposed/npatch/ui/page/manage/AppManagePage.kt
@@ -114,11 +114,16 @@ fun AppManageBody(
         is ProcessingState.Idle -> Unit
         is ProcessingState.Processing -> LoadingDialog()
         is ProcessingState.Done -> {
-            val it = viewModel.optimizeState as ProcessingState.Done
+            val it = viewModel.optimizeState as ProcessingState.Done<AppManageViewModel.OptimizeResult>
             val optimizeSucceed = stringResource(R.string.manage_optimize_successfully)
             val optimizeFailed = stringResource(R.string.manage_optimize_failed)
             LaunchedEffect(Unit) {
-                snackbarHost.showSnackbar(if (it.result) optimizeSucceed else optimizeFailed)
+                val message = if (it.result.success) {
+                    optimizeSucceed
+                } else {
+                    it.result.messageRes?.let { resId -> lspApp.getString(resId) } ?: optimizeFailed
+                }
+                snackbarHost.showSnackbar(message)
                 viewModel.dispatch(AppManageViewModel.ViewAction.ClearOptimizeResult)
             }
         }
diff --git a/manager/src/main/java/org/lsposed/npatch/ui/viewmodel/manage/AppManageViewModel.kt b/manager/src/main/java/org/lsposed/npatch/ui/viewmodel/manage/AppManageViewModel.kt
index 30adcf0..d6d3117 100644
--- a/manager/src/main/java/org/lsposed/npatch/ui/viewmodel/manage/AppManageViewModel.kt
+++ b/manager/src/main/java/org/lsposed/npatch/ui/viewmodel/manage/AppManageViewModel.kt
@@ -17,6 +17,7 @@ import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import org.lsposed.npatch.Patcher
+import org.lsposed.npatch.R
 import org.lsposed.npatch.lspApp
 import org.lsposed.npatch.share.Constants
 import org.lsposed.npatch.share.PatchConfig
@@ -45,6 +46,11 @@ class AppManageViewModel : ViewModel() {
         object Refresh : ViewAction()
     }
 
+    data class OptimizeResult(
+        val success: Boolean,
+        val messageRes: Int? = null
+    )
+
     // 手動管理狀態，避免實時響應系統廣播導致列表跳動
     var appList: List<Pair<AppInfo, PatchConfig>> by mutableStateOf(emptyList())
         private set
@@ -55,7 +61,7 @@ class AppManageViewModel : ViewModel() {
     var updateLoaderState: ProcessingState<Result<Unit>> by mutableStateOf(ProcessingState.Idle)
         private set
 
-    var optimizeState: ProcessingState<Boolean> by mutableStateOf(ProcessingState.Idle)
+    var optimizeState: ProcessingState<OptimizeResult> by mutableStateOf(ProcessingState.Idle)
         private set
 
     private val logger = object : Logger() {
@@ -195,8 +201,13 @@ class AppManageViewModel : ViewModel() {
         Log.i(TAG, "Perform optimize for ${appInfo.app.packageName}")
         optimizeState = ProcessingState.Processing
         val result = withContext(Dispatchers.IO) {
-            ShizukuApi.performDexOptMode(appInfo.app.packageName)
+            if (!ShizukuApi.isRootBackend()) {
+                Log.w(TAG, "Optimize refused: Shizuku backend is not root, uid=${ShizukuApi.getBackendUidOrNull()}")
+                OptimizeResult(success = false, messageRes = R.string.manage_optimize_permission_denied)
+            } else {
+                OptimizeResult(success = ShizukuApi.performDexOptMode(appInfo.app.packageName))
+            }
         }
         optimizeState = ProcessingState.Done(result)
     }
-}
\ No newline at end of file
+}
diff --git a/manager/src/main/res/values-zh-rCN/strings.xml b/manager/src/main/res/values-zh-rCN/strings.xml
index e1a3f81..968a25d 100644
--- a/manager/src/main/res/values-zh-rCN/strings.xml
+++ b/manager/src/main/res/values-zh-rCN/strings.xml
@@ -41,6 +41,7 @@
     <string name="manage_optimize">优化</string>
     <string name="manage_optimize_successfully">优化成功</string>
     <string name="manage_optimize_failed">优化失败</string>
+    <string name="manage_optimize_permission_denied">权限不足：优化功能要求 Shizuku 运行在 Root 特权下</string>
     <string name="manage_uninstall_successfully">卸载成功</string>
     <string name="manage_no_modules">尚无模块</string>
     <string name="manage_module_settings">模块设置</string>
diff --git a/manager/src/main/res/values/strings.xml b/manager/src/main/res/values/strings.xml
index 6b7f7ee..bf54a99 100644
--- a/manager/src/main/res/values/strings.xml
+++ b/manager/src/main/res/values/strings.xml
@@ -42,6 +42,7 @@
     <string name="manage_optimize">Optimize</string>
     <string name="manage_optimize_successfully">Optimize successfully</string>
     <string name="manage_optimize_failed">Optimize failed</string>
+    <string name="manage_optimize_permission_denied">Insufficient privilege: optimize requires Shizuku running as root</string>
     <string name="manage_uninstall_successfully">Uninstall successfully</string>
     <string name="manage_no_modules">No modules yet</string>
     <string name="manage_module_settings">Module settings</string>