diff --git a/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/AssetsUtils.java b/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/AssetsUtils.java
index 67ae5a7..06063d8 100644
--- a/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/AssetsUtils.java
+++ b/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/AssetsUtils.java
@@ -44,26 +44,6 @@ public class AssetsUtils {
 
     private static final String TAG = LogDebug.PLUGIN_TAG;
 
-    /**
-     * @param context
-     * @param name
-     * @return
-     */
-    public static final String readUTF8(Context context, String name) {
-        InputStream is = null;
-        try {
-            is = context.getAssets().open(name);
-            return IOUtils.toString(is, Charsets.UTF_8);
-        } catch (Throwable e) {
-            if (LOGR) {
-                LogRelease.e(TAG, e.getMessage(), e);
-            }
-        } finally {
-            CloseableUtils.closeQuietly(is);
-        }
-        return null;
-    }
-
     /**
      * 提取文件到目标位置
      * @param context
diff --git a/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/SysUtils.java b/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/SysUtils.java
index e64c148..ae7a64c 100644
--- a/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/SysUtils.java
+++ b/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/loader/utils/SysUtils.java
@@ -16,17 +16,11 @@
 
 package com.qihoo360.loader.utils;
 
-import android.text.TextUtils;
-
 import com.qihoo360.replugin.helper.LogRelease;
-
 import com.qihoo360.replugin.utils.CloseableUtils;
-import com.qihoo360.replugin.utils.IOUtils;
 
 import java.io.FileInputStream;
-import java.io.InputStream;
 
-import static com.qihoo360.replugin.helper.LogDebug.LOG;
 import static com.qihoo360.replugin.helper.LogRelease.LOGR;
 
 /**
@@ -38,6 +32,7 @@ public final class SysUtils {
 
     /**
      * 返回当前的进程名
+     *
      * @return
      */
     public static String getCurrentProcessName() {
@@ -64,39 +59,4 @@ public final class SysUtils {
         }
         return null;
     }
-
-    /**
-     * 检测是否模拟器（Release版本不做任何处理，总是返回false）
-     * @return
-     */
-    public static boolean isEmulator() {
-        if (LOG) {
-            try {
-                Process pr = Runtime.getRuntime().exec("getprop ro.hardware");
-                int code = pr.waitFor();
-                if (code == 0) {
-                    InputStream in = pr.getInputStream();
-                    byte buffer[] = new byte[1024];
-                    try {
-                        int rc = IOUtils.read(in, buffer, 0, buffer.length);
-                        String str = new String(buffer, 0, rc, "UTF-8");
-                        if (!TextUtils.isEmpty(str) && str.contains("goldfish")) {
-                            return true;
-                        }
-                    } catch (Throwable e) {
-                        if (LOGR) {
-                            LogRelease.e(TAG, e.getMessage(), e);
-                        }
-                    }
-                    CloseableUtils.closeQuietly(in);
-                }
-                pr.destroy();
-            } catch (Throwable e) {
-                if (LOGR) {
-                    LogRelease.e(TAG, e.getMessage(), e);
-                }
-            }
-        }
-        return false;
-    }
 }
diff --git a/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/IOUtils.java b/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/IOUtils.java
index 3c1805e..08bf123 100644
--- a/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/IOUtils.java
+++ b/replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/IOUtils.java
@@ -269,34 +269,4 @@ public class IOUtils {
         }
         return count;
     }
-
-    /**
-     * Reads bytes from an input stream.
-     * This implementation guarantees that it will read as many bytes
-     * as possible before giving up; this may not always be the case for
-     * subclasses of {@link InputStream}.
-     *
-     * @param input where to read input from
-     * @param buffer destination
-     * @param offset initial offset into buffer
-     * @param length length to read, must be >= 0
-     * @return actual length read; may be less than requested if EOF was reached
-     * @throws IOException if a read error occurs
-     */
-    public static int read(final InputStream input, final byte[] buffer, final int offset, final int length)
-            throws IOException {
-        if (length < 0) {
-            throw new IllegalArgumentException("Length must not be negative: " + length);
-        }
-        int remaining = length;
-        while (remaining > 0) {
-            final int location = length - remaining;
-            final int count = input.read(buffer, offset + location, remaining);
-            if (EOF == count) { // EOF
-                break;
-            }
-            remaining -= count;
-        }
-        return length - remaining;
-    }
 }