Abstract: Located in Chaheji tectonic belt,the west of BaXian depression in central Hebei province,Chaheji oilfield is a typical complex fault block sandstone reservoir.The oilfield has entered high water cut period and the difficulty on adjustment and exploitation also increases year by year.By integrated use of seismic,geology,logging,testing and development of dynamic information data,highlighting the integrity of the study and the combination of dynamic and static data,an outstanding fine geologic modeling and remaining oil quantitative description,etc have been applied.According to the concept of the secondary development of optimization design and development plan of work,the application of advanced technology initially formed technology development zone with fine reservoir description research process,which made significant breakthrough in reservoir.By the use of Triangular grid computing method and the fault of all or part of the ladder,effectively solve the complex intersection relationship between the fault and complex fault block,the whole geological model is set up,which provides reliable geological basis for the numerical simulation and development adjustment.The successful application of the achievements in Chaheji oilfield indicates the unity realization of development zone and the key blocks description of the whole research,and its technical breakthrough will provide technical reference for the implementation of the "secondary development" complex fault block of Huabei oilfield.