Abstract: After 20 years of development,Jidong Nanpu oilfield has entered into high water cut development stage,with comprehensive water cut of more than 90% and the recovery degree of only 10%,therefore,the remaining oil is abundant.In order to improve the old oilfield development effect,in view of the geological characteristics of complex fault block oil reservoir,with the secondary development under the guidance of the concept of "triple",the secondary development technology exploration and practice in Nanpu oilfield land Es_32+3 reservoir has been carried out,and the multilayer complex fault block sandstone reservoir with secondary development pattern has been preliminary formed.Through fine reservoir description,the underground reconstruction system has been established,which can effectively improve the accuracy of geological model and residual oil distribution.Through more means to demonstrate development technical policies and optimize formation series,well patterns and development manners so as to effectively improve the level of reservoir development.By improving the techniques of drilling engineering and ground engineering,the work efficiency can be effectively improved,with reduced energy consumption.