Virtual simulation, also known as virtual reality technology or simulation technology, is a virtual system to imitate another real system of technology. In a narrow sense, virtual simulation refers to the 1940s along with the development of computer technology and the gradual formation of a new class of experimental research technology; in a broader sense, virtual simulation is in the course of mankind's understanding of the objective laws of nature has been effectively used. As a result of the development of computer technology, simulation technology has gradually become a system of its own, following the mathematical reasoning, scientific experiments after the human understanding of the objective laws of nature, the third category of basic methods, and is developing into a human understanding, transformation and creation of the objective world of a universal, strategic technology.