Abstract:This paper collects detailed information about the Ludian earthquake casualties in terms of the spatial distribution,age distribution,sex proportion,ethnic composition about earthquake casualties,and analyzes the causes of the death. This paper compares the characteristics of the death with the similar earthquake in China. Considering local socio-economic and personnel activity,this article also estimates the casualties if the earthquake occurred at night. The study provides reference for further understanding of casualty risk in north-east area of Yunnan Province.