Abstract: Volume method is one of the basic methods for the calculation of gasoil reserves. However, parameters used traditionally are average values, and from large area calculation. The results obtained in this way are not accurate, and can not reflect the characteristics of nonuniform reservoirs.In this paper, we have developed a new method, unit volume method, to count gas-oil reserves, and have drawn from the results obtained,a gasoil reserve distribution map which will play a good guiding role not only in the study of non-uniformity of gas-oil strata,but in oil expioration,development and well pattern as well.