Abstract: By using 53 years' heavy rain storms data in Leshan,Meishan and Ya'an from year 1958 to 2010,climate trend analysis method,temporal distribution and spatial distribution of heavy rainstorms in southwest Sichuan region are studied.Results show:1) The main heavy rain storms happened in northeast of Ya'an,Southwest Meishan and Northwest Leshan in 53 years and made that region to be the center of heavy rain storms.2) The happening times of heavy rain storms are going down in Hongya,E'mei,Jiajiang and Tianquan region.But the happening times in Ya'an,Qingshen and Mechuan are going up in Ya'an,Qingshen and Muchuan region at the same period.3) The happening times of heavy rain storms in Ya'an and Leshan distribution are consistent with each other.The happening times of heavy rain storms in Meishan had little relationship with Ya'an and Leshan area.4) The main distribution characteristic of heavry rain storms in three regions is accordant and has a central area in Ya'an,Mingshan,Hongya and E'mei.The second distribution characteristic of the heavry rain storms is the opposite relevant status in Ya'an and E'mei.The synoptic analysis of two historic heavy rain storm processes are carried and the weather background and condition of heavy rain storms are revealed.