全球变暖和强厄尔尼诺现象导致2015年是全球年平均气温最高的一年, 近50年来，我国夏季高温热浪的频次和强度总体呈增多、增强趋势。我国西南东南部地区高温酷暑天气的发生规律如何呢？它存在着哪些变化特征呢？东亚地区的环流系统在1970s后期出现显著的调整，西太副高、东亚西风急流的强度以及位置出现显著的变化，但到底这两个系统的相互作用、配置关系以及对ENSO的共同响应是否发生变化呢？这种变化又将对我国西南东南部地区的高温酷暑天气的发生发展产生怎样的影响呢？这些问题的研究都具有重要的科学意义和现实意义。

2015 is the warmest year on the record because of global warming and strong El Nino event. In recent 50 years, , the frequency and intensity of heat waves and hot spells in China are incresing. How the evolution process for heat waves and hotspells between SW China and SE China is different? What is the different charateristics? The atmospheric circulation system over East Asia after late 1970s appeared significantly of adjustment, and both the internsity and location of Western North Pacific Subtropical High and westerly jet stream change obviousl, How this two systems work together , how they response to ENSO, and whether these changes will indeed affect the summer temperature extreme over SW China and SE China? All these questions are still unknown, Research on these issues are of great scientific and practical significance.