Abstract: The study on a long-term test of fixed position in the hill and dry sloping land shows that the conversation tillage technology of submiling high stubble has the advantages of preserving soil moisture，avoiding the loss of soil and water，improving the soil structure and controlling the weed growth．And it also has the biological effects，such as accelerating the growth of winter wheat and increasing of the crop yield．Compared with the tradition tillage，it can increase the yield by703．6kg／hm²，the average increase rate is 18．8％ in two years；the water use efficiency by 1．9kg／hm²mm，the increaserate is 16．8％.