Virtual machine is an imitative computer by using imitative way of softwae.To develop OS software by means of it can shorten the developing period and reduce the difficulties of development.

• 摘要虚拟机是使用软件模拟的方法在电脑上模拟出来的计算机，利用它来开发OS软件能显著地缩短开发周期，降低开发难度。