目的　利用 1973～ 1975年全国人口死因回顾调查中调整死亡率位于前九位的恶性肿瘤资料 ,初步探讨其统计分布规律。方法　Poisson分布 ,负二项分布 ,混合Poisson分布。结果　①大多数恶性肿瘤不服从Poisson分布 ,呈2～ 6阶混合Poisson分布 ,个别呈负二项分布 ;②大多数肿瘤在男、女性别之间的统计分布也存在差异 ;③个别肿瘤的统计分布不明。结论　大多数恶性肿瘤呈多阶聚集性分布 Objective To investigate the statistical distribution of malignant tumors with the highest mortality in the first nine retrospective surveys of the national population from 1973 to 1975. Method Poisson distribution, negative binomial distribution, mixed Poisson distribution Results ① Most of the malignant tumors did not obey the Poisson distribution, and presented a mixed Poisson distribution of 2 ~ 6 orders with some negative binomial distributions. ② The statistical distribution of most tumors was also different between men and women. ③ The statistics of individual tumors Distribution unknown. Conclusions Most malignant tumors show multi-order aggregated distribution