Abstract: The Daqing oil field is the first,in our country,to be developed by adopting internal water-flooding by separate zones in one well at the very beginning of the field's development.This paper points out that,the field with mufti-layered sandstones should be developed by zones separately in one well,on the basis of grouping the layers into several zones.Only through the continuous testing and adjustment by separate zones in one well during the development by water flooding,we can control effectively the field's development to achieve a high standard of development technique.