Based on multiple meteorological data, including NCEP 1°×1° reanaly sis data, routineobservational data， automatic weather station data, Doppler radar data and FY2C satellite TBB data, the multiscale characteristic of the s erver heavy rain happened in Liuzhou during 12-13 June 2007 was analyzed and its mechanism was also discussed. The results show that: because of the guidance func tion of east plateau low trough on 500hPa, the cold air gone south. The quasis tationary front moved from Guizhou to Guangxi and “the frontl oa better relation to the mesoβscale low vortex disturbance. The precipitati on systems were the convective cloud clusters from south Guangxi and MCC near t he frontal surface. Liuzhou heavy precipitation was created by two rain clusters . Because of the train effect of precipitation echo and ground mesoscale shear line, one of rain clusters had heavy intensity and long persistent time, this wa s a main reason which Liuzhou server heavy rainfall produced.w trough situation” formed at ground surface. The heavy rain developed in the 8 50hPa low trough, the center of heavy rain had