Abstract: Development of Monte Carlo method is over sixty years.It is widely used in nuclear science and other relative fields.It has superpower capability in simulating various complicated geometry.With precision point-wise cross-section,it can simulate various particle transport problems,such as neutron,photon,electron,α particle and proton etc.With rapid development of computers and large scale parallel computation,Monte Carlo method is a first tool for simulating particle transport problems.

Key words: Monte Carlo, complicated geometry, particle transport, parallel computation, first tool