Under the view of historic transformation,talents of agricultural extension have experienced four periods:individual behavior period,agricultural officer system period,revitalizing agricultural scholar period and technical personnel period,which now gradually makes a transition to S&T expert period.The quantity is changing from less to much,and gradually shifts to elite group; technology is changing from lower to higher level,and gradually shifts to the highest peak; capacity is changing from singleness to comprehensiveness,and gradually shifts to versatility.Not every personnel can bear and refine a talent of agricultural extension,who needs to have the ideological quality of loving and improving agriculture, knowledge quality of familiarizing agriculture,countryside and farmers,the technical quality of specialized technique,good physical quality and the preaching quality of affecting people’s morale.Therefore,promoting personnel to become a talent must follow the regulations for endogenous development:regulations from government promotion,regulations from public demand,regulations from applicable technology,regulations from educational formation and regulations from cooperation between technics and enterprises.