Abstract: Yangjiaba oilfield which began to product oil in 1988 is a old oilfield now. According to analysis in position and problem of the oilfield, this paper provides a series of measures to improve the development effect in the afternoon of development life. The goal of the management in the afternoon of development life is to improve the injection efficiency and make full use of the remaining oil of the reservoir. The practice of Yangjiaba oilfield during one year proved that the guidelines and measures is very suitable to the oilfield in the afternoon of development life like Yangjiaba oilfield which is a low permeability reservoir, and have made good results.