Abstract: Introduce the general situation, structure and technical characteristic of self-management oilfield’s Christmas tree in Bohai Sea, CNOOC. Depend on the examples of Christmas trees’ transformation for “Both Pumping Flooding in One Well”, carry on the analysis of the technical request, difficulty, implemental ways and gaining effect in the Christmas trees’ transformation in order to satisfy the demands for the different stimulation. Bring forward the proposal to the Christmas tree’s choice and transformation from the selected angle of the Christmas trees’ design, use and maintenance.