To give full play to the function of connotation of soil and water conservation and to reinforce the harness of soil erosion is required in the increase of harness benefit,the augment of agricultural staying power and the development of commercial economy.It raises some cenceptions on the establishment of soil and water conservtionsystem of science,including:1.to stress "consciousness effect"in teh leading mind;2.wielding "entirety effect"to stress the working mechanism of the soil and water conservation system;3.using "comprehensive effect"to stress the quality standard of technics about prevention,harness,management and utilization;4.to take small watershed as unit is an important method in the system;5.with "legal effet"to harness in society is connected closely to the system of the soil and water conservation science.