diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 6ebc09080..a928c9ee7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -11,6 +11,7 @@
 
 1. 不要提交无意义改动。
 1. 除非是提交复现问题的测试用例，请确保`gradlew testSdk`构建成功（需要连接Android设备）
+1. 测试机需要至少有API 28，API 19两种机器，以保证ART和Dalvik虚拟机都能正常工作。
 1. 尽量原子化的提交，配有较为清晰的提交信息。
 
 我们会根据大家的PR再调整PR的要求的。
diff --git a/projects/sdk/core/loader/src/main/kotlin/com/tencent/shadow/core/loader/managers/PluginPackageManagerImpl.kt b/projects/sdk/core/loader/src/main/kotlin/com/tencent/shadow/core/loader/managers/PluginPackageManagerImpl.kt
index 532118ae9..1b38d0bc3 100644
--- a/projects/sdk/core/loader/src/main/kotlin/com/tencent/shadow/core/loader/managers/PluginPackageManagerImpl.kt
+++ b/projects/sdk/core/loader/src/main/kotlin/com/tencent/shadow/core/loader/managers/PluginPackageManagerImpl.kt
@@ -18,10 +18,8 @@
 
 package com.tencent.shadow.core.loader.managers
 
-import android.annotation.TargetApi
 import android.content.ComponentName
 import android.content.pm.*
-import android.os.Build
 import com.tencent.shadow.core.runtime.PluginPackageManager
 
 internal class PluginPackageManagerImpl(private val hostPackageManager: PackageManager,
@@ -42,14 +40,6 @@ internal class PluginPackageManagerImpl(private val hostPackageManager: PackageM
                 hostPackageManager.getPackageInfo(packageName, flags)
             }
 
-    @TargetApi(Build.VERSION_CODES.O)
-    override fun getPackageInfo(versionedPackage: VersionedPackage?, flags: Int): PackageInfo? =
-            if (packageInfo.applicationInfo.packageName == versionedPackage?.packageName) {
-                packageInfo
-            } else {
-                hostPackageManager.getPackageInfo(versionedPackage, flags)
-            }
-
     override fun getActivityInfo(component: ComponentName, flags: Int): ActivityInfo {
         if (component.packageName == packageInfo.applicationInfo.packageName) {
             val pluginActivityInfo = allPluginPackageInfo()
diff --git a/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PackageManagerInvokeRedirect.java b/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PackageManagerInvokeRedirect.java
index c8380d439..373f1f8a8 100644
--- a/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PackageManagerInvokeRedirect.java
+++ b/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PackageManagerInvokeRedirect.java
@@ -54,7 +54,7 @@ public static PackageInfo getPackageInfo(ClassLoader classLoaderOfInvokeCode, St
     @TargetApi(Build.VERSION_CODES.O)
     public static PackageInfo getPackageInfo(ClassLoader classLoaderOfInvokeCode, VersionedPackage versionedPackage,
                                              int flags) throws PackageManager.NameNotFoundException{
-        return getPluginPackageManager(classLoaderOfInvokeCode).getPackageInfo(versionedPackage, flags);
+        return getPluginPackageManager(classLoaderOfInvokeCode).getPackageInfo(versionedPackage.getPackageName(), flags);
     }
 
     public static ProviderInfo resolveContentProvider(ClassLoader classLoaderOfInvokeCode, String name, int flags) {
diff --git a/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PluginPackageManager.java b/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PluginPackageManager.java
index 57181b543..3da709ac7 100644
--- a/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PluginPackageManager.java
+++ b/projects/sdk/core/runtime/src/main/java/com/tencent/shadow/core/runtime/PluginPackageManager.java
@@ -5,7 +5,6 @@
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.ProviderInfo;
-import android.content.pm.VersionedPackage;
 
 public interface PluginPackageManager {
     ApplicationInfo getApplicationInfo(String packageName, int flags);
@@ -14,7 +13,5 @@ public interface PluginPackageManager {
 
     PackageInfo getPackageInfo(String packageName, int flags);
 
-    PackageInfo getPackageInfo(VersionedPackage versionedPackage, int flags);
-
     ProviderInfo resolveContentProvider(String name, int flags);
 }