Ab srt act According to the precipitation data of seven elements of automatic meteorological station, the precipitation data of regional automatic weather station and the conventional observation, we comprehensively analyzed a regional heavy rainfall weather process in west and south Guizhou Province affected by typhoon Haiou from 8:00 on September 16 to 8:00 on September 19,2014 .Results showed that under the favorable large-scale conditions,cold trough on 500 hPa long wave and strong East airflow blocked the typhoon moving to north.The path of typhoon was west.Long wave guided the cold air move toward to south , with invasion of the typhoon depression, and the increase of convergence motion.The invasion of cold air made the whole structure change into the"warm up and cool down".The high and low altitude power, heat, water vapor and unstable conditions in Guizhou Province were beneficial for the rainfall process .The special landform of west and high east low in southwest re-gion played an important role in the intensity of the heavy rainfall and its predicted area.%利用贵州省七要素自动气象站雨量资料、区域自动气象站雨量资料及常规观测等资料，对2014年9月16日8：00～19日8：00受15号台风“海鸥”影响发生在贵州省西部和南部的一次区域性暴雨天气过程进行综合分析。结果表明，在有利的大尺度背景条件下，受500 hPa长波冷槽和强盛的副高南侧偏东气流影响，阻挡台风北上，台风路径偏西，长波冷槽引导冷空气南下，侵入台风低压，加大辐合上升运动。冷空气的侵入使整层结构变为“上暖下冷”的结构，贵州省高、低空动力，热力，水汽和不稳定条件均有利于这次降雨过程的形成。西南地区特殊的西高东低的地形对暴雨的强度以及落区等起重要作用。
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