By use of large deviation theorem, this paper researches deeply to how to estimate such probability.

本文利用大偏差定理对此概率如何进行估计进行深入研究。

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Large deviation theory provides a good method to calculus the probability of rare event, which will have great impact once it happens although its probability may be very small.

大偏差理论提供了一个很好的办法来计算小概率事件的概率，尽管这种事件发生的概率可能会很小，但是一旦发生将会产生巨大的影响。

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Usually the probability of rare event derived from large deviation method can be expressed as a solution of variational problem.

通常，源于大偏差方法的小概率事件的概率可以作为一个变分问题的解。

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