Based on two-year radar data of severe weather in Beijing,echo characteristics of severe storm are studied. The echo top of severe storms such as hailstorms and thunderstorms accompanied by gale is higher than that of heavy rain,the former is up to 12km. However,the latter is only 7km.Comparing with local heavy rain,the movement of radar echoes of hailstorms and thunderstorms is rapid. Based on analyzing the radial velocity,it is concluded that the dynamic structure of hailstorms and thunderstorms is quite different from that of the heavy rain. Moreover,the influence of topography is also very significant.