The agricultural activity is one of the most important human factors that affect the evolvement of regional ecological environment, in the papers the technological measures during the course of developing of agriculture are studied systemic, the point that farming system is the main factor of agricultural activity influence the evolvement of regional ecological environment is put forward to, the evolvement mechanism of the wasteland system, fallowing system, rotation system, intensive cultivation to ecological environment in Source region of Yangtse Rive, Huanghe River and Lantsang is discussed systemic, and the degree of the farming system to evolvement of ecological environment in different stages is compared and analysed.