A severe convection process on 18 May 2018 is studied by the conventional observation data, GFS analysis field data with the spatial resolution of 0.25°×0.25° and temporal resolution of 6 hours, automatic weather station data, and SB Doppler radar data in the middle part of Zhejiang Province. It is demonstrated that this process triggered three types of storms: pulse storm, multicell storms and squall line. These storms were accompanied by the hail shortterm heavy rain, thunderstorm and gale, respectively. The corresponding characteristics of the radar echoes of three storms are as follows: (1) The radar echoes of the pulse storm were in lumpy pieces. The initial height was 6 to 9 km and the heights of strong echoes were around the isotherm of -10 ℃. The strong intensity was up to 60 dBz. The VIL value increased rapidly and the maximum value was 50 kg·m-2. The small hail and gale appeared after the rapid decrease of reflectivity and VIL. (2) The mediumtostrong multicell storms were in a beltlike distribution. The train effect and high precipitation efficiency were responsible for the wide range heavy precipitation. The gale was in relation to MARC (MidAltitude Radial Convergence) of the velocity product and strong convergence. (3) The squall line appeared to be a bow echo. It moved with high speed and caused the extreme gale and thunderstorm. This multistorm severe convective process is of important significance for shortterm weather forecasting in the future.