The paper discussed existent rate and area of soil and water
conservation measures and calculation methods for reducing flood
and sediment through slope measures and warping dam as well as their applications in He-Long area,Jinghe,Beiluohe,and Weihe watershed in the middle reach of the Yellow River.Research results of soil and water
conservation method showed that the mean flood and sediment reduced 0.5456 billion m~3 and 0.2238 billion tons in Helong area,Jinghe,Beiluohe,Weihe watershed respectively from 1970 to 1996,which accounted for 4.6% and 22.9% of the total amount in the corresponding watershed.The reduced flood and sediment from soil and water conservation measures increased chronologically;the sediment and scouring water into the lower reach reduced 0.157 billion tons and 4.5 billion m~3 respectively.The reduced flood and sediment from warping dam accounted for 59.3% and 64.7% of the total
flood and sediment reduction from soil and water conservation measures respectively.The water and sediment reduction from warping dams decreased chronologically and shown a periodic and unsustainable trend.The ecological protection policy was discussed in the middle reach of the Yellow River based on ecological construction of soil and water conservation,the relationship between engineering measures,ecological measures and cultivation measures,forest and grass measures and ecological protection.