Monte Carlo method is becoming the first choice of particle transport simulation methods because of its strong capability of complicated geometry treatment, perfected nuclear data and universal property. Monte Carlo softwares have been rapidly developing with the development of computers and at present, they are widely used in applications sa radiation shielding, criticality safety analysis, post-treatment of spent fuel, radioactivity waste treatment, decommissioning retire of nuclear facilities, emergence of nuclear accident, nuclear well-logging and nuclear medical science, etc. This paper provides a brief introduction of the development of Monte Carlo simulations in the past and at present and perspectives about its future.