Abstract: This article introduced the system reliable analysis's general method, and has given the system simulation process, as well as system reliable parameter statistics. The reliability of the system simulation, which is built on the principle of Monte Carlo ideology. Its basic idea is: When solving problems for a certain probability of the emergence, the emergence frequency of such incidents is obtained by a large number of random tests the probability replaced by the frequency. This simulation method has applied the Monte Carlo thought and the computer simulation, has carried on the analysis to the system reliability, and has given the analysis of simulation result.