diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj b/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj
index 78370395195c57e3fcab85a355eaafd6cc6d9021..64e83351b8ca195b42f0a0b32b7537f8e6ba5bdb 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj
@@ -30,6 +30,7 @@
 		FCEBEC2C20E1391F00C0B14D /* paddle_mobile.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FCEBEC2B20E1391F00C0B14D /* paddle_mobile.framework */; };
 		FCEBEC2D20E1391F00C0B14D /* paddle_mobile.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = FCEBEC2B20E1391F00C0B14D /* paddle_mobile.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		FCEEE7D4210627A000444BEC /* banana.jpeg in Resources */ = {isa = PBXBuildFile; fileRef = FCEEE7D3210627A000444BEC /* banana.jpeg */; };
+		FCF437E8214B6DDB00943429 /* Multi-Predict-ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = FCF437E7214B6DDB00943429 /* Multi-Predict-ViewController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -75,6 +76,7 @@
 		FCDFD41A211D91C7005AB38B /* synset.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = synset.txt; sourceTree = "<group>"; };
 		FCEBEC2B20E1391F00C0B14D /* paddle_mobile.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = paddle_mobile.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		FCEEE7D3210627A000444BEC /* banana.jpeg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = banana.jpeg; sourceTree = "<group>"; };
+		FCF437E7214B6DDB00943429 /* Multi-Predict-ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Multi-Predict-ViewController.swift"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -140,6 +142,7 @@
 				FC039B8A20E11C560081E9F8 /* LaunchScreen.storyboard */,
 				FC039B8D20E11C560081E9F8 /* Info.plist */,
 				FC27991121343A39000B6BAD /* paddle-mobile-demo-Bridging-Header.h */,
+				FCF437E7214B6DDB00943429 /* Multi-Predict-ViewController.swift */,
 			);
 			path = "paddle-mobile-demo";
 			sourceTree = "<group>";
@@ -343,6 +346,7 @@
 			files = (
 				FC039B8420E11C550081E9F8 /* ViewController.swift in Sources */,
 				FC013928210204A3008100E3 /* PreProcessKernel.metal in Sources */,
+				FCF437E8214B6DDB00943429 /* Multi-Predict-ViewController.swift in Sources */,
 				FCBCCC552122EF5500D94F7E /* MetalHelper.swift in Sources */,
 				FC039B8220E11C550081E9F8 /* AppDelegate.swift in Sources */,
 			);
diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/Base.lproj/Main.storyboard b/metal/paddle-mobile-demo/paddle-mobile-demo/Base.lproj/Main.storyboard
index a5efadeb97ccc41449dc32a2c1dfcdfcf9fceac5..2a6d748bbe43327d6c4155ff42b5821a4c601210 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo/Base.lproj/Main.storyboard
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/Base.lproj/Main.storyboard
@@ -11,6 +11,34 @@
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
+        <!--Multi Predict View Controller-->
+        <scene sceneID="ec4-AW-9Vs">
+            <objects>
+                <viewController id="Vwd-lt-764" customClass="Multi_Predict_ViewController" customModule="paddle_mobile_demo" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="55D-rz-Ex6">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="TQt-X9-PdF">
+                                <rect key="frame" x="164" y="318" width="46" height="30"/>
+                                <state key="normal" title="Button"/>
+                                <connections>
+                                    <action selector="predictAct:" destination="Vwd-lt-764" eventType="touchUpInside" id="d4z-Cv-6jY"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <constraints>
+                            <constraint firstItem="TQt-X9-PdF" firstAttribute="centerY" secondItem="55D-rz-Ex6" secondAttribute="centerY" id="bL3-wr-TcH"/>
+                            <constraint firstItem="TQt-X9-PdF" firstAttribute="centerX" secondItem="55D-rz-Ex6" secondAttribute="centerX" id="sBi-RQ-sJn"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="bsd-h4-RYZ"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="68E-SG-96s" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-1438" y="331"/>
+        </scene>
         <!--View Controller-->
         <scene sceneID="tne-QT-ifu">
             <objects>
@@ -199,7 +227,7 @@
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-724" y="98.50074962518741"/>
+            <point key="canvasLocation" x="-719" y="-18"/>
         </scene>
     </scenes>
     <resources>
diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/Multi-Predict-ViewController.swift b/metal/paddle-mobile-demo/paddle-mobile-demo/Multi-Predict-ViewController.swift
new file mode 100644
index 0000000000000000000000000000000000000000..2ffdd0f17edfdfdcbbd230493fccfab04cb6001b
--- /dev/null
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/Multi-Predict-ViewController.swift
@@ -0,0 +1,24 @@
+//
+//  Multi-Predict-ViewController.swift
+//  paddle-mobile-demo
+//
+//  Created by liuRuiLong on 2018/9/14.
+//  Copyright © 2018年 orange. All rights reserved.
+//
+
+import UIKit
+import paddle_mobile
+
+class Multi_Predict_ViewController: UIViewController {
+  var runner1: Runner!
+  var runner2: Runner!
+  override func viewDidLoad() {
+    super.viewDidLoad()
+//    let net = MobileNet_ssd_hand.init(device: MetalHelper.shared.device)
+//    runner1 = Runner.init(inNet: <#T##Net#>, commandQueue: <#T##MTLCommandQueue?#>, inPlatform: <#T##Platform#>)
+  }
+
+  @IBAction func predictAct(_ sender: Any) {
+    
+  }
+}
diff --git a/metal/paddle-mobile/paddle-mobile/MobilenetSSD_AR.swift b/metal/paddle-mobile/paddle-mobile/MobilenetSSD_AR.swift
index 7debb79c737e363940a735c4f74c7c9efbe58c0b..106a1882ff9dd6edeff107f013c282346fd83977 100644
--- a/metal/paddle-mobile/paddle-mobile/MobilenetSSD_AR.swift
+++ b/metal/paddle-mobile/paddle-mobile/MobilenetSSD_AR.swift
@@ -30,7 +30,7 @@ public class MobileNet_ssd_AR: Net{
   class MobilenetssdPreProccess: CusomKernel {
     init(device: MTLDevice) {
       let s = CusomKernel.Shape.init(inWidth: 160, inHeight: 160, inChannel: 3)
-      super.init(device: device, inFunctionName: "mobilent_ar_preprocess", outputDim: s, usePaddleMobileLib: false)
+      super.init(device: device, inFunctionName: "mobilent_ar_preprocess_half", outputDim: s, usePaddleMobileLib: false)
     }
   }
   
diff --git a/metal/paddle-mobile/paddle-mobile/PaddleMobile.swift b/metal/paddle-mobile/paddle-mobile/PaddleMobile.swift
index b43ea3742bc23d18b596d7f90935da840342dbfd..cd329394c6cce744d6e3c4de61ed3df6aa00b070 100644
--- a/metal/paddle-mobile/paddle-mobile/PaddleMobile.swift
+++ b/metal/paddle-mobile/paddle-mobile/PaddleMobile.swift
@@ -16,7 +16,7 @@ import Foundation
 
 class ScaleKernel: CusomKernel {
   init(device: MTLDevice, shape: Shape) {
-    super.init(device: device, inFunctionName: "scale", outputDim: shape, usePaddleMobileLib: false)
+    super.init(device: device, inFunctionName: "scale_half", outputDim: shape, usePaddleMobileLib: false)
   }
 }
 
diff --git a/metal/paddle-mobile/paddle-mobile/framework/Executor.swift b/metal/paddle-mobile/paddle-mobile/framework/Executor.swift
index 1cc8c08713e4c513a4247f2d19d4f151634892a3..f76d86c4725d6a89a2add77c584cd55d77154c75 100644
--- a/metal/paddle-mobile/paddle-mobile/framework/Executor.swift
+++ b/metal/paddle-mobile/paddle-mobile/framework/Executor.swift
@@ -14,10 +14,10 @@
 
 import Foundation
 
-let testTo = 114
+let testTo = 2
 var isTest = false
 
-let computePrecision: ComputePrecision = .Float32
+let computePrecision: ComputePrecision = .Float16
 
 public class ResultHolder {
   public let dim: [Int]
@@ -67,7 +67,7 @@ public class Executor<P: PrecisionType> {
     queue = inQueue
     for block in inProgram.programDesc.blocks {
       //block.ops.count
-      for i in 0..<block.ops.count {
+      for i in 0..<testTo {
         let op = block.ops[i]
         do {
           let op = try OpCreator<P>.shared.creat(device: inDevice, opDesc: op, scope: inProgram.scope)