diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/Net/MobileNetCombined.swift b/metal/paddle-mobile-demo/paddle-mobile-demo/Net/MobileNetCombined.swift
index 1f5468d797c24e3129745f721a992f059c9c4c59..3afe84fde90c343ae0fdf4dc1fef2a1bc1cd8dd8 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo/Net/MobileNetCombined.swift
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/Net/MobileNetCombined.swift
@@ -23,8 +23,11 @@ public class MobileNetCombined: Net {
         paramPath = Bundle.main.path(forResource: "combined_mobilenet_params", ofType: nil) ?! "para null"
         inputDim = Dim.init(inDim: [1, 224, 224, 3])
         metalLoadMode = .LoadMetalInCustomMetalLib
-        metalLibPath = Bundle.main.path(forResource: "paddle-mobile-metallib", ofType: "metallib")
+        let paddleMobileMetallib = Bundle.main.path(forResource: "paddle-mobile-metallib", ofType: "metallib")
+        metalLibPath = paddleMobileMetallib
         useMPS = true
+        preprocessKernel = ScaleKernel.init(device: device, shape: Shape.init(inWidth: 224, inHeight: 224, inChannel: 3), metalLoadMode: .LoadMetalInCustomMetalLib, metalLibPath: paddleMobileMetallib)
+        
     }
     let labels = PreWords.init(fileName: "vision_synset")
 
diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift b/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift
index 3fad441a2e2441766006f1df2a8fd53523be8185..a13b6303ac3c8127761a5449e186d896cbf8925f 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift
@@ -27,6 +27,8 @@ public class YoloNet: Net {
         metalLibPath = Bundle.main.path(forResource: "paddle-mobile-metallib", ofType: "metallib")
         useMPS = true
         paramPrecision = .Float16
+        preprocessKernel = ScaleKernel.init(device: device, shape: Shape.init(inWidth: 416, inHeight: 416, inChannel: 3), metalLoadMode: .LoadMetalInCustomMetalLib, metalLibPath: Bundle.main.path(forResource: "paddle-mobile-metallib", ofType: "metallib"))
+        
     }
     
     override  public func resultStr(res: [ResultHolder]) -> String {
diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift b/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift
index 1aa9d82654047bde999a8c6be44d6dfb845d0c71..53c417e88d64926160a95829498425646c2ba1ad 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift
@@ -100,16 +100,15 @@ class ViewController: UIViewController {
             
             
             if self.toPredictTexture == nil {
-                
-                //        runner.getTexture(inBuffer: buffer!) { [weak self] (texture) in
-                //          self?.toPredictTexture = texture
-                //        }
-                
                 let beforeDate = Date.init()
-                runner.getTexture(image: selectImage!.cgImage!) { [weak self] (texture) in
-                    let timeUse = Date.init().timeIntervalSince(beforeDate)
-                    print("get texture time use: \(timeUse)")
-                    self?.toPredictTexture = texture
+                if modelType == .mobilenet_combined || modelType == .yolo {
+                    self.toPredictTexture = try! MetalHelper.shared.textureLoader.newTexture(cgImage: selectImage!.cgImage!, options: nil)
+                } else {
+                    runner.getTexture(image: selectImage!.cgImage!) { [weak self] (texture) in
+                        let timeUse = Date.init().timeIntervalSince(beforeDate)
+                        print("get texture time use: \(timeUse)")
+                        self?.toPredictTexture = texture
+                    }
                 }
             }
         } else {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Scale.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Scale.swift
index 4a6a9a3ee4b2558fbf2a7442717400ef19c22b33..cab3f3b0db922612f4fc4752ba0c95a554c05ec1 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Scale.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Scale.swift
@@ -14,8 +14,8 @@
 
 import Foundation
 
-class ScaleKernel: CusomKernel {
-    init(device: MTLDevice, shape: Shape, metalLoadMode: MetalLoadMode, metalLibPath: String?) {
+public class ScaleKernel: CusomKernel {
+    public init(device: MTLDevice, shape: Shape, metalLoadMode: MetalLoadMode, metalLibPath: String?) {
         if GlobalConfig.shared.computePrecision == .Float32 {
             super.init(device: device, inFunctionName: "scale", outputDim: shape, metalLoadModel: metalLoadMode, metalLibPath: metalLibPath)
         } else if GlobalConfig.shared.computePrecision == .Float16 {