Abstract: Urbanization and ecological environment were taken as the research subjects, in combination with the current situation of Chengdu, and by use of coupling model, analysis was made of the level of urbanization and ecological environment interaction coupling degree between 1999 and 2013 and GM(N, 1)model was used to predict the composite index. The results showed that the urbanization and ecological environment comprehensive index of Chengdu undergoes a rising trend; the relationship between the two is roughly in a state of basic coordinated development with the environmental development lagging a little behind. The GM(1, 1)model predicts that in the future three years the urbanization comprehensive index will be 0.49, 0.53, and 0.58 respectively, and that the GM(2, 1)model predicts the ecological environment comprehensive index is 0.234, 0.239, 0.243.