In this paper we discuss two key problems of it, which are when and how to make checkpoint.We use Markov Chain technology to get optimal time for making checkpoint and present an algorithm for it.

• 讨论了检查点技术应用的两个关键问题，即何时以及如何建立检查点：利用马尔可夫链模型计算检查点建立的最优时间和一个检查点建立算法。