Abstract: Using new generating Doppler weather radar of Hailaer data ,the synoptic rain process were analyzed on June 30,2007 in Chenqi county.The results showed：On the conditions of Large-scale circulation having no comprehensive indication on rainstorms weather,the features of high level humidity of local meteorological elements provided proper moisture condition for rainstorms;During the course of rainstorms,the radar echoes are stable and less dynamic, the radial velocity echoes are a clear against the wind zone,and the cumulative vertical liquid water content and vertical wind profile products have a clear indication meaning.