The features and formation causes of a shortterm heavy rainstorm process is studied by the conventional observation data, automatic weather station data, GFS analysis field data with the special resolution of 05° and the temporal resolution of 6 hours, Doppler radar and FY2E satellite data in the northern part of Zhejiang Province on 24 June 2013 The results suggests that due to the influences by the southwest warm moist air flow near the edge of subtropical high and the shear line at 850 hPa, the severe convection was triggered. It has good predictability for severe convection that the 925 hPa mesoscale convergence line overlaid the vertical upward region in the middle troposphere at 700 hPa. That is to say, severe convection could happen near the mesoscale convergence line under the situation. The mesoscale convergence line, which occurred earlier than the rainfall and induced by the confluence of easterly flow and northeasterly flow, triggered the shortterm heavy rainstorm in the northern part of Zhejiang Province.