中文摘要：

本文利用西南地区多个站点所取得的1951-2008年逐月降水量资料，结合1948-2008年的17层高度场和风场资料，重点取200hPa与700hPa两个层次，分析了与西南地区夏季旱涝年对应的环流异常特征，结果表明：欧亚地区中高纬地区环流（特别是乌山和贝湖附近高度距平的变化）以及西南地区上空伴随高度场出现的气旋性环流和反气旋性环流是直接影响我国西南地区夏季降水的重要环流因子。

英文摘要：

It is used the monthly precipitation data of more than one site in the Southwest from 1951 to 2008, with 17 floors height field, temperature and wind field data since 1948 ,and focused on the two levels of 200hPa and 700hPa to analyse the summer drought in the Southwest corresponding circulation anomalies characteristics, the results showed that： the circulation in the high latitudes of Europe and Asia （ especially the change of height anomalies near the Ural Mountains and Lake Baikal）, the cyclonic circulation over the Southwest appeared and the anti - cyclonic circulation with the height field impact on the summer rainfall in the southwest of China.