深刻认识我国极端降水事件的细致演变及发生发展的物理机制具有重要的科学价值和现实意义。以往研究我国极端降水着重分析气候变化趋势和气候平均统计特征，或对个例进行数值模拟探讨天气尺度和中尺度动力学成因，而对我国广大区域的大量个例进行中尺度统计分析的研究还不多，有必要进一步分析不同地区极端降水精细化演变特征和中尺度发生发展机制的时空分布。.因此，将利用稠密的地面气象站分钟级观测资料和业务天气雷达逐6分钟反射率资料、天气图、探空资料，分析2011-2016年我国96°E以东广大地区极端降水事件的瞬时雨强时间演变等基本特征，分析降水系统的组合反射率宏观结构和移动，分析出流边界、地面辐合线等对流系统的地面中尺度触发和发展机制，分析中尺度特征与天气背景和环境大气热动力状况的关系，旨在获得极端降水事件这些多尺度特征的时空分布，完善已有的物理机制认识和概念模型，为提高我国极端降水的精细化预报水平提供科学基础。

To advance the understanding of detailed evolution of extreme precipitation event in China and the underlying physical mechanisms governing its initiation and development is of scientific and practical importance. Previous studies on extreme precipitation in China have mainly investigated the trends and mean climatology, or analyzed the synoptic and mesoscale dynamical causes of representative cases using numerical modeling. However, statistical analysis of the mesoscale features for a large number of extreme precipitation events over the extensive region of China is rather limited in literature. Therefore, it is necessary to further investigate the temporal and spatial characteristics of the detailed evolution and mesoscale development of extreme precipitation events over a variety of regions in China..This project will collectively use the minutely surface observations collected at the densely distributed surface meteorological observation stations, 6-min radar reflectivity data, weather maps, and sounding data to analyze the following aspects of extreme precipitation events occurred in China (east of 96°E longitude) during 2011-2016..(a) Detailed evolutional features of precipitation during individual extreme events such as temporal evolution of instantaneous (5-min) rainfall intensity..(b) Structural and movement features of extreme-rain-producing mesoscale systems in terms of composite radar reflectivity..(c) Surface mesoscale features such as cold outflow boundaries and convergent lines that are of critical relevance to the initiation and development of extreme-rain-producing convective systems..(d) Relationships between the mesoscale features and both the synoptic background and the thermodynamics-and-dynamics of environmental atmosphere..Through the aforementioned analysis, this project aims to reveal the multi-scale characteristics of extreme precipitation events in China, which will improve the current understanding of physical mechanisms and the established conceptual model, and provide the scientific basis for improving forecast skill for extreme precipitation events in China.