Ninety-five people were killed and 2014 people were injured in the Minxian-Zhangxian M_S6.6 earthquake that occurred on July 22, 2013. Houses in rural areas were severely damaged. The damage ratio of houses in heavy disaster areas was more than 36.59%. The combined effect of the earthquake and continuous rain induced a large number of landslides, collapses, and other geological disasters, which resulted in serious losses of life and property in the disaster area. In this study, a considerable amount of basic data are obtained through the investigation of degree of damage for different building types, population, number of deaths, cause of death, topography, and geological hazards in the disaster area. Further, the causes of death attributed to the earthquake and the damage ratio of different building types are obtained through analysis. Multiple linear regression fitting is used to obtain the relation between death toll data and the damage ratio of houses in nine administrative villages in the heavily impacted disaster area. The relation is validated using similar data for the population and the damage ratio of houses but from different intensity areas. The results show that the total death toll calculated using this method is 16 more than the actual one with a total error rate of 17.02%.