Abstract: By taking M area of PL oilfield as an example,for the introduction of the "normalization" into the ground crude oil properties evaluation,the statistical regression analysis method is adopted to evaluate the nature of in-place crude oil.With the combination of these two methods,the crude oil properties in the area have been finally determined.Through comparison between the theoretical and measured values of the analysis,the methodology of crude oil properties proposed in this article is of strong applicability.