diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift b/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift
index 2a9f93977dd3adf4262390ad0b27c45bfc3e1c08..5fcbda127004d6941ad573f9a0f6509665da8bc9 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/ViewController.swift
@@ -108,15 +108,14 @@ class ViewController: UIViewController {
           guard let sSelf = self else {
             fatalError()
           }
-          if success {
+          if let inResultHolder = resultHolder, success {
             if i == max - 1 {
               let time = Date.init().timeIntervalSince(startDate)
-              print(Array<Any>.floatArrWithBuffer(floatArrBuffer: resultHolder!.result!, count: resultHolder!.capacity).strideArray())
+            
+              print(inResultHolder.result.floatArr(count: inResultHolder.capacity).strideArray())
               DispatchQueue.main.async {
-                //                print(resultHolder!.result![0])
                 sSelf.resultTextView.text = sSelf.runner.net.resultStr(res: resultHolder!)
                 sSelf.elapsedTimeLabel.text = "平均耗时: \(time/Double(max) * 1000.0) ms"
-                
               }
             }
           }
diff --git a/metal/paddle-mobile/paddle-mobile/Common/Extensions.swift b/metal/paddle-mobile/paddle-mobile/Common/Extensions.swift
index e51fda8ce966f7c3ffde68779d944286f62d8e53..12bc909be97b372ce9f82daf035dced0b969cdc7 100644
--- a/metal/paddle-mobile/paddle-mobile/Common/Extensions.swift
+++ b/metal/paddle-mobile/paddle-mobile/Common/Extensions.swift
@@ -120,9 +120,17 @@ extension Array {
   }
 }
 
+extension UnsafeMutablePointer {
+  public func floatArr(count: Int) -> [Pointee]{
+    var arr: [Pointee] = []
+    for i in 0..<count {
+      arr.append(self[i])
+    }
+    return arr
+  }
+}
 
-
-extension String{
+extension String {
   func cStr() -> UnsafePointer<Int8>? {
     return (self as NSString).utf8String
   }
diff --git a/metal/paddle-mobile/paddle-mobile/CustomNet/Genet.swift b/metal/paddle-mobile/paddle-mobile/CustomNet/Genet.swift
index 6babcc744d71aab8c722d1cf9d5ec332e138c0c2..06eec498f558633fbc19e64b3b12dd139ace518d 100644
--- a/metal/paddle-mobile/paddle-mobile/CustomNet/Genet.swift
+++ b/metal/paddle-mobile/paddle-mobile/CustomNet/Genet.swift
@@ -48,7 +48,7 @@ public class Genet: Net {
   
   override  public func resultStr(res: ResultHolder) -> String {
 //    fatalError()
-    return " \(res.result![0]) ... "
+    return " \(res.result[0]) ... "
   }
   
 }
diff --git a/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNet.swift b/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNet.swift
index db7948000866c14f443bf7611de5f4a13bb49bf7..9f2cebf25c33d13dc2d50feabaf21572c51bbbd7 100644
--- a/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNet.swift
+++ b/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNet.swift
@@ -43,9 +43,7 @@ public class MobileNet: Net{
   let labels = PreWords.init(fileName: "synset")
   
   override public func resultStr(res: ResultHolder) -> String {
-    guard let resPointer = res.result else {
-      fatalError()
-    }
+    let resPointer = res.result
     var s: [String] = []
     (0..<res.capacity).map { resPointer[$0] }.top(r: 5).enumerated().forEach{
       s.append(String(format: "%d: %@ (%3.2f%%)", $0 + 1, labels[$1.0], $1.1 * 100))
diff --git a/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNetCombined.swift b/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNetCombined.swift
index f0f871c96024ce115d3d998767a08c9daf928800..9c50cf623a08b0e60f1eea2e5410cefd34cdb4d4 100644
--- a/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNetCombined.swift
+++ b/metal/paddle-mobile/paddle-mobile/CustomNet/MobileNetCombined.swift
@@ -41,7 +41,7 @@ public class MobileNetCombined: Net {
   
   override  public func resultStr(res: ResultHolder) -> String {
     //    fatalError()
-    return " \(res.result![0]) ... "
+    return " \(res.result[0]) ... "
   }
   
 }
diff --git a/metal/paddle-mobile/paddle-mobile/CustomNet/MobilenetSSD_AR.swift b/metal/paddle-mobile/paddle-mobile/CustomNet/MobilenetSSD_AR.swift
index 56af7339cb0a91a0b208b8f2c327829567448091..a36bbab9782e0429bc8cf6cc36bdcd7bc9d79910 100644
--- a/metal/paddle-mobile/paddle-mobile/CustomNet/MobilenetSSD_AR.swift
+++ b/metal/paddle-mobile/paddle-mobile/CustomNet/MobilenetSSD_AR.swift
@@ -47,7 +47,7 @@ public class MobileNet_ssd_AR: Net{
   }
   
   override public func resultStr(res: ResultHolder) -> String {
-    return " \(res.result![0])"
+    return " \(res.result[0])"
   }
   
   override func fetchResult(paddleMobileRes: GPUResultHolder) -> ResultHolder {
diff --git a/metal/paddle-mobile/paddle-mobile/CustomNet/YoloNet.swift b/metal/paddle-mobile/paddle-mobile/CustomNet/YoloNet.swift
index 0cb1cb7755cde70d25b71a7078b451fb01b92fd9..4dd4f6b249a8eb15de4ff5c9ed7291e214b4c559 100644
--- a/metal/paddle-mobile/paddle-mobile/CustomNet/YoloNet.swift
+++ b/metal/paddle-mobile/paddle-mobile/CustomNet/YoloNet.swift
@@ -43,8 +43,7 @@ public class YoloNet: Net {
   //    }
   
   override  public func resultStr(res: ResultHolder) -> String {
-    //    fatalError()
-    return " \(res.result![0]) ... "
+    return " \(res.result[0]) ... "
   }
   
 }
diff --git a/metal/paddle-mobile/paddle-mobile/Net.swift b/metal/paddle-mobile/paddle-mobile/Net.swift
index 0131ef5981e38506cb77af36887b0f4e9ef1386d..82aaa265997d9bb5d1017e51f5cc5769a56395b8 100644
--- a/metal/paddle-mobile/paddle-mobile/Net.swift
+++ b/metal/paddle-mobile/paddle-mobile/Net.swift
@@ -17,17 +17,17 @@ import Foundation
 import Metal
 
 public class ResultHolder: NSObject {
-  @objc public let result: UnsafeMutablePointer<Float32>?
+  @objc public let result: UnsafeMutablePointer<Float32>
   @objc public let capacity: Int
 
-  init(inResult: UnsafeMutablePointer<Float32>?, inCapacity: Int) {
+  init(inResult: UnsafeMutablePointer<Float32>, inCapacity: Int) {
     result = inResult
     capacity = inCapacity
   }
   
   @objc public func releasePointer() {
-    result?.deinitialize(count: capacity)
-    result?.deallocate()
+    result.deinitialize(count: capacity)
+    result.deallocate()
   }
 }
 
@@ -86,7 +86,11 @@ public class Net: NSObject {
   }
   
   func fetchResult(paddleMobileRes: GPUResultHolder) -> ResultHolder {
-    return ResultHolder.init(inResult: paddleMobileRes.resultPointer, inCapacity: paddleMobileRes.capacity)
+    guard let inResPointer = paddleMobileRes.resultPointer else {
+      fatalError()
+    }
+    
+    return ResultHolder.init(inResult: inResPointer, inCapacity: paddleMobileRes.capacity)
   }
   
   func updateProgram(program: Program) {
diff --git a/metal/paddle-mobile/paddle-mobile/Operators/FetchOp.swift b/metal/paddle-mobile/paddle-mobile/Operators/FetchOp.swift
index 33bf04244f1d5eb5e3ae3b059f6b3922bd866726..b26231c7b5e4e45b268dc5b59eb7374d3622d7f5 100644
--- a/metal/paddle-mobile/paddle-mobile/Operators/FetchOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Operators/FetchOp.swift
@@ -83,7 +83,7 @@ class FetchOp<P: PrecisionType>: Operator< FetchKernel<P>, FetchParam<P>>, Runab
   
   func delogOutput() {
     print("fetch output: ")
-    let resArr = Array<Any>.floatArrWithBuffer(floatArrBuffer: self.para.output.result, count: self.para.output.capacity)
+    let resArr = self.para.output.result.floatArr(count: self.para.output.capacity)
     print(resArr.strideArray())
   }
 }