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长江干流区在我国经济发展中有举足轻重的地位，是我国东西经济联系的纽带和桥梁。气候变化是当今气象界讨论的重要课题，其对全球日益紧张的水资源影响已引起各国政府、学者的关注。以重庆、万县、汉口、宜昌、贵池五站为代表，通过长江干流区近８０年观测资料和每站对应的气温、降水资料，分析了气候变化对长江干流区径流量的影响。以分组频率法找出了各站的枯水年、平水年、丰水年。丰枯水年降水量距平百分率分别为２２．６％～３０．８％及－２２．１％～－２９．４％，径流量为６．４～９．６％及－２．７～－７．０％。
The mainstream area of the Yangtze River plays a decisive role in the economic development of our country and is a bridge and link between the east and the west of our country. Climate change is an important issue discussed by the meteorological community today. Its impact on the increasingly tense global water resources has drawn the attention of governments and scholars all over the world. Taking Chongqing, Wanxian, Hankou, Yichang and Guichi as representatives, the influence of climate change on the runoff in the main stream of the Yangtze River was analyzed based on the observed data of 80 years in the mainstream of the Yangtze River and the corresponding temperature and precipitation data of each station. By group frequency method to find out the dry years, flat water year, wet years. The average annual rainfall anomaly percentage was 22.6% -30.8% and -22.1% -29.4% respectively, and the runoff was 6.4-9.6% and -2.7 ~ -7.0%.