中文摘要：

对2007年7月16—19日高原低涡东移形成的川渝地区大范围大暴雨过程，利用自动气象站雨量资料、常规观测资料、FY-2C TBB云图资料和T213分析场资料，采用天气动力学和中尺度诊断方法，分析了大暴雨的形成机制。结果表明：此次大范围大暴雨过程是高原低涡诱发西南低涡发展从而形成耦合系统造成的，其垂直上升运动气柱和涡柱的耦合发展与维持是低涡发生发展并产生持续性强降水的动力机制，对流层下部深厚不稳定层结的形成和维持是低涡发展并形成持续对流性降水的热力层结条件。

英文摘要：

Based on the rain gauge data at automatic weather stations, conventional observations, FY-2C TBB satellite pictures and T213 analysis data, the genesis mechanism of a large-scale heavy rain process from 16 to 19 of July in 2007 of Sichuan- Chongqing were analyzed by the synoptic dynamics and mesoscale diagnosis methods. The results show that： the occurrence of heavy rain are caused by the coupling system reformed by the Plateau vortex inducing the development of the southwest vortex; the development and persistence coupling system between the vertical ascending motion and the cyclonic vorticity are the dynamic mechanisms for the genesis, development of the vortex and the persistence of the heavy precipitation; the formation and maintenance of the deep unstable stratification in the lower troposphere are the necessary thermal stratification conditions for developing the vortex and reforming the persistent convective activity and convective precipitation.