Through analysis of agroclimatic ecological environment in main mountains (Dabie mountain, Sennongjia mountain, Tianmu mountain, Xuefeng mountain, Wuyi mountain, and Yunkai mountin) in the eastern part of subtropics of China,it was found that the growing adaptabilities of grain and economic crops vary in the different slopes of each mountains. The main results obtained are.1. Heat condition is the key climatic ecological factor restricting to grow grain and economic crops. Concretely, grain crops (e. g. ric...