Abstract: In order to improve the mechanized production level of alfalfa in Shanxi Province and accelerate the production capacity of high-quality forage in Yanmenguan ecotone between agriculture and animal husbandry, this paper puts forward the key points of the application of mechanized technology in the whole process of alfalfa production from the aspects of plot selection, mechanized operation links and operation requirements, so as to promote the improvement of forage mechanization level and quality.