Abstract: Exploitation of agriculture is a means of promoting agriculture productivity.Introducing strategic environmental assessment(SEA)to agriculture helps avoid adverse impact of agricultural exploitation on the environment.The necessity of using SEA in agriculture is also elaborated.According to timing of the usage of SEA in agriculture,it can be classified into three types:predicting SEA,supervising SEA,retrospecting SEA.Basic contents of SEA in exploitation of agriculture consist preliminarily of objects,principles,index system and methods of the assessment.Basic working procedure is also put forward for SEA of agriculture.