The purposes.es of the plea of soil and water ocns, rvation on tine part of loess plateau are far tare reasonable development and comprehensive of i:hhe natural resourca cn looms plsteau，eontrollin te soil d caters la.a giving out sugg.stisns to m9..o the loe xIateau The benaats discus3 in tzis paper are tn direct oooacr!uc benefit bar oseritg sail and water a the benefit from reducing silt in :"lxi 0r ,.lein the flcad，end thr eni."0onment and social bonefit. this paper discusses the feasibility of the plan of soil and water plan of soil and water consorvation on the part of loess plateau in lnner mangolia during two periods，from 1986 to 1990 and from 1991 to 2000