Based on the 711-digital weather radar data in Weibei area of Shaanxi Province between May and September from 2000 to 2006,335 cases of mesoscale convective systems (MCS) were classified into three categories (cell,linear and areal MCS) and nine sub-categories (slightly moving cell,moving cell,merging cell,trailing stratiform (TS),leading stratiform (LS),parallel stratiform (PS),broken linear,broken areal and embedded areal MCS).The primary characteristics including frequency,diurnal variation,duration,horizontal scale and moving speed of echo,of each category were also statistically analyzed in this paper.In particular,differences in hail disasters (hail occurrence and damage) among MCSs of different categories were analyzed.The results show that the linear MCS has a maximum probability for hails,and the cell MCS possesses a minimum probability;and the TS MCS tends to bring about severest weather disaster,and the slightly moving cell MCS produces lightest disaster.