By using precipitation data measured in Chayu,Bomi,Milin and Linzhi testing stations from 1970-2010,the distribution of precipitation in Linzhi district was analyzed with coefficient of skewness,coefficient of kurtosis and Chi-square test.Those failed to test were tested again by changing the square root.The results showed that the annual precipitation in Linzhi district is subject to normal.The seasonal precipitation in summer and autumn is subject to normal.Only one station in spring and winter failed to test.The monthly precipitation in most stations in dry seasons is not subject to normal distribution,and many are subject to the normal distribution in wet seasons.After the change of square root,it has passed the test of coefficient of skewness,coefficient of kurtosis and Chi-square,and the contribution rate to pass is 8.3％.It also passed the test of coefficient of skewness,kurtosis and chi square of the monthly precipitation in Linzhi district after the change of square root and the contribution rate to pass is 41.7％ and 16.7％ respectively.The pass rate of monthly coefficient of skewness is 90％ and the pass rate of chi square test is 85.4％ after the change of square root.%利用林芝地区察隅、波密、米林、林芝4个测站1970 ～ 2010年降水资料,采用偏度系数、峰度系数检验和x2检验方法,对林芝地区降水量进行正态分布检验分析,未通过检验的用平方根变换方法后进行再检验.结果表明,林芝地区年降水量服从正态分布;季降水量夏季和秋季服从正态分布,冬、春季各有一站未通过检验;月降水量干季大多不服从正态分布,湿季服从正态分布的较多;经平方根转换后对季降水偏度系数、峰度系数检验和x2检验检验通过的贡献率均为8.3％,对月降水正态性偏度(峰度)检验和x2检验检验通过的贡献率分别为41.7％、16.7％;平方根转换后月偏度(峰度)检验检验通过率达90.0％,x2检验检验通过率达85.4％.
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