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本文研究了音字转换中使用的语言模型问题，从语言模型复杂度的角度研究了三种解决零概率问题的方法的效率，back-off方法，删除插值和非线性插值方法．并且给出了这些方法下使得语言模型复杂度最小的参数的递推公式，通过实验验证了这些递推公式的正确性．
This paper studies the problem of linguistic model used in pronunciation conversion, and studies the efficiency, back-off method, deletion interpolation and nonlinear interpolation of three methods to solve zero-probability problem from the perspective of language model complexity. The recursion formulas of the parameters which make the language model least complicated are given. The correctness of the recursion formulas is verified by experiments.