Abstract: Xianhezhuang Oilfield is composed of many block faults, these block faults' area is smaller and their geologic condition is very complicated. Xianhezhuang Oilfield has been developed over 30 years by now. Most part of the block faults has been in high water cut stage, water flood seriously, and interformational contradiction is extremely predominant. To the development of the oilfield, especially to its further production in high water cut stage, boron neutron lifetime log has peculiar advantage compared with other log method. The article introduces technique of boron neutron lifetime log, and emphasize its application in Xianhezhuang Oilfield. It dissects several typical wells. It evaluates remaining oil in this area, and directs the development and adjustment of the units by means of boron neutron lifetime log. It unearths intrabedded and intraformational potentiality of remaining oil, and it provides reference to the application in the same type of oil field.