Abstract:Chinese family trees are valuable in the study of long-term population dynamics. Based on demographic data from 1506~2000 from a Chinese (Han) family tree and circular distribution analysis, the authors show that the highest constituent proportion of deaths in men was 15.09% from 21:00~23:00 followed by 14.15% from 11:00~13:00 in a 24~hour day. The lowest was 3.47% from 5:00~7:00 followed by 3.87% from 7:00~9:00. The highest was 4.35 times that of the lowest and this difference was highly significant (P<0.0...