The technology of reserves inversion has become the main method in the course of oil exploration and exploitation. Fully using the characteristic that the well log has the high resolution in vertical and the seismic data has better continuity in level to direct the oil exploration and exploitation by the technology of reservior inversion to find the rule of the reserves distributed. But in the reason of the difference of the apparatus type and the measure time, the well log data has the influence on the demarcate precision and the inversion result. In the case of inversion result in SN31 area in Junggar Basin to analysis the influence of the well data pretreatment on well restrict inversion.