摘要： The statistic G was performed for testing familial aggregation on survey data of schistosomiasiscases in Zhouhe Township,Weishan County,Yunnan Province.The T value calculated from the data of1987 was 8.03 and the P value was much less than 0.01,suggesting a high familial aggregation ofschistosomiasis cases in the Township.Three natural villages of the Township were selected for thesame purpose to collect data before and after the reformation of the Agricultural Administration