Abstract: During the process of analyzing failure risk of corrosion in buried pipeline, it is difficult to calculate failure probability of pipeline with traditional mathematic analytic methods. But when adopting Monte Carlo method, it is unnecessary to know the actual value of corrosion rate. By knowing the probability distribution of corrosion rate, or determining the probability distribution of corrosion rate from statistical data, corrosion process may be simulated easily. In virtue of the powerful function in value calculation. Monte-Carlo ' s spot simulation may be improved effectively. By calculating the failure probability of a given pipeline, the feasibility of Monte-Carlo is proved.