Abstract: In order to reveal the mechanism of the Fushun strong storm, using the conventional data, Shenyang Doppler radar data and FY-2E infrared satellite data, the author studied the causes and drop zones of Fushun strong storm on 31 July 2010. The results showed that: the main impact weather systems of the strong storm in Fushun on 31 July 2010, was the western pacific subtropical high, cold vortex and Mongolia cyclone. The 584 dagpm contours southwards through Fushun was an important indicator for Fushun rainstorm forecasting; low-level temperature ridges and the trough of middle and upper level constituted unstable stratification of the atmospheric. The convergence caused by weather systems and upfliting of Fushun mountain triggered heavy rainfall; the proper coupling of the exit region of high-level and low-level jet stream was the important reason of strong heavy rainfall in Fushun; the left front of low-level warm tongue and the maximum gradient of the moisture flux divergence was the drop zones of the strong rainstorm; the vertical configuration that low-level convergence and upper level divergence was momentum causes of strong storm; satellite imagery and Doppler radar data in nowcasting warning of this strong rainstorm played an important role.