Abstract: To study the impact of climate on the yields of Corns of Banan District, Chongqing, using multiple methods of climatic diagnosis, this article analyzes the connection between the corn yields and the climatic factors. The results showed that the air temperature of Banan District was slowly declining and the annual precipitation also had an inclination of decrease, while the annual sunshine hours slightly increased. Extreme changes of the air temperature, precipitation and sunshine hours were not obvious. Variety of analytical methods showed that climate change of the Banan District had a great influence on the yield of corn, and on the whole, was not conducive to corn yield.