Based on the panel data of 11 provinces in the western region from 2012 to 2016,the evaluation index system of technological innovation and agricultural modernization was constructed. The coupling coordination degree model was used to empirically examine the coordinated development of technological innovation and agricultural modernization in the western region. The results show that there is a strong correlation between technological innovation and agricultural modernization in the western region. The development level of technological innovation and agricultural modernization in the provinces during the inspection period are not high. Chongqing,Sichuan and Shanxi are lagging behind in agricultural modernization,while the other 8 provinces are all lagging behind in technology innovation. The coupling degree of technological innovation and agricultural modernization in the western region is low,and shows a trend of rising fluctuations. There are four types of coupling coordination,such as endangered disorders,mildly disordered,moderately disordered and severely disordered.