The interpretation models of different types of log parameters which are corresponding to different reservoir petrophysical facies can be established by the use of logging, core and test data in Chang 6 reservoir of Yanhewan area, Ansai oilfield. By the data points fitting of calibrated log interpretation model of classification core, it improves the uniformity and linearity during the fitting of permeability or other complex relationships. It overcomes the characteristics of low signal to noise ratio and low resolution which exist in the low permeability reservoirs and provides an effective method to accurately establish the model of ultra-low permeability reservoir parameters.