Abstract: Conservation tillage is a modern farming technology system with straw mulching，no（less）tillage and seeding as main content.It can effectively reduce soil wind erosion and water erosion，increase soil fertility and water conservation and drought resistance capacity，improve agricultural ecological and economic benefits.Advantages，main machines and tools，operation process and key points，key points for attention and other contents of technical model of protective cultivation of full coverage and return of corn straw to the field were introduced.It can provide reference for popularization and application of conservation tillage technology.