How to install win8 for virtual machine?

Microsoft opened the Windows 8.1 preview online update in the first day of the Build 2013 Developer Conference on the morning of June 27th. Windows 8 users can download and install an upgrade boot tool to upgrade to Windows 8.1 Preview through Windows Store online update. . The next day, Microsoft opened the Windows 8.1 preview version of the ISO image download address to the public. It provides 13 language versions including Simplified Chinese and Traditional Chinese. Each language is divided into 32-bit and 64-bit versions. You can download it here.
Because you can't uninstall the Win8.1 preview after using ISO, and it will affect some installed applications. In order to avoid all kinds of concerns, you can use the virtual machine software to install the trial Windows 8.1 Preview, so as to avoid the installation is not affected. The original system and application can not be adapted to the early adopters and do not have to worry about completely replacing the system. Below we use the virtual machine software Vitualbox to install the Win8.1 preview version.

Notes on using the ISO to install the Win8.1 preview system
Installing the Win8.1 preview using the ISO image requires special attention: If you decide to use the ISO to install the Windows 8.1 preview, you will not be able to uninstall it. If you decide to restore your previous operating system, you will need to reinstall the operating system using the recovery or installation media (usually DVD media) that came with your computer. If you are running Windows 8 and have no recovery media, you can create a USB recovery drive. If you are running Windows 7, Windows Vista, or Windows XP and you don't have recovery media, you can use the software provided by your computer manufacturer to create recovery media from your computer's recovery partition. After installing the Windows 8.1 preview, you will not be able to recover from the previous Windows using the recovery partition on your computer.