Some local rainstorm of urban area of Beijing led to the great calamity on July 10,2004, 18 precipitation stations data of suburb nearby of Beijing were collected in the paper, to analyze cause of formation and space-time distribute of rainstorm, and quantitatively research on recurrence interval about total amount of rainstorm and intensity.

Through analyzing the weather situation,a local torrential rain event is analyzed in detail based on the intensity and velocity data from Doppler weather radar as well as vertical wind profilers and two dimensional wind fields derived from velocity data.

The forecasting of local torrential rainfall caused by micro-and meso-scale weather systems is a difficult task in short-range weather forecasting or nowcasting service,so it is necessary to make further study to provide the detail weather services for 2008 Beijing Olympic Games.

The result shows that the local heavy rain event with a spatial scale of about.

The investigation shows that the boundary layer jets often turn up during the clear nights after days with an extreme high temperature or local heavy rain, and there is obvious diurnal variation for their intensities.

A local heavy rain occurred on July 13-14,2008 in Zhengzhou.