Abstract: In order to study thoroughly frequent rainstorm weather in Weifang area, the author summarized the type rainstorm weather, induced summer often happens, by using conventional observation data and satellite, automatic weather station, Doppler radar data, the rainstorm process in Weifang area in July 4, 2012 were analyzed. Scale mechanics and dynamic weather results showed that: impact system this rainfall was shear line of low layer and surface trough, very favorable large scale circulation situation under the control of the subtropical high, strong divergence low-level moisture accumulation and high bulk to provide thermal and dynamical conditions of strong convection. A thorough analysis of this type of typical heavy rainfall in summer in Weifang area is for the prediction for the accumulation of experience.