1.VirtualBox5.1安装
http://download.virtualbox.org/virtualbox/5.1.10/virtualbox-5.1_5.1.10-112026_Ubuntuxenial_amd64.deb
2.VirtualBox安装插件安装
http://download.virtualbox.org/virtualbox/5.1.10/Oracle_VM_VirtualBox_Extension_Pack-5.1.10-112026.vbox-extpack

4. 安装步骤这里很详细我就复述了
   https://xuanwo.org/2015/08/09/vmware-mac-os-x-intro/

注意事项:

1. macox系统盘请使用原版
2. 配置完虚拟机不要运行安装
3. 在终端输入 macox为你的虚拟机名字:

VBoxManage modifyvm "macosx" --cpuidset 00000001 000106e5 00100800 0098e3fd bfebfbff
VBoxManage setextradata "macosx" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "iMac11,3"
VBoxManage setextradata "macosx" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0"
VBoxManage setextradata "macosx" "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple"
VBoxManage setextradata "macosx" "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
VBoxManage setextradata "macosx" "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1

4. 重启VirtualBox 运行安装