Abstract: The main producing horizons in Taixing Oil field,northern Jiangsu Basin are characterized by strong heterogeneity,which resulted in poor development result.It is necessary to study the reservoir heterogeneity quantitatively in order to make sure the reservoir connectivity between the water injector and producer.By calculating the variation function and analyzing the variation parameters,3D reservoir parameter models were proposed and simulated.The heterogeneity of each reservoir can clearly be recognized by the models,which provi ded an useful information for development of the Oil field.