Abstract: The value table of P-Ⅲ Distribution is significant for plotting the P-Ⅲ curve.The prensent value table was calculated in 1960, updating it is necessary.Using series formulas instead of integratingmethod, present method saves a lot of CPU time and the results match the results of Mathematical Handbook. Combining the Newtonian Iteration Method and the interpolation iteration method, the degree ofconvergence of value is 10-10.The prsent paper gives some differences between the old value tableand present results. And the Chiners software has been worked out.

Key words: P-Ⅲdistribution, continued fraction, value table, Newtonian iteration, interpolationiteration

摘要： PⅢ分布曲线的离均系数值表是PⅢ曲线的根本，目前我国所采用的值表是在较落后计算条件下产生的，本文在利用连分级数及求和级数精确计算PⅢ分布积分的基础上，联合牛顿迭代法与弦截矩法，可以很快地在已知Cs和频率P(%)的情形下迭代求得离均系数值．并和英文原版数学手册的有关数值进行了对比，结果完全相符，在此基础上，给出了几个频率P(0.001-1.0%），Cs从0.0-6.5（间隔0.1）的值表，原值表与现值表在频率很小时在小数后面的第二位有差异，本文给出的其对比结果．作者编制了汉化的软件．

关键词: P啊分布, 连分级数计算, 离均系数值表, 牛顿迭代法, 弦截矩法