This paper used the MIFA method to calculate the fractal dimension of 21 samples of an inspection well in M block of Daqing Oilfield, and applied the fractal dimension to divide the reservoir into three types, meanwhile used the capillary pressure curves to carry out the reservoir classification. The results show that the reservoir types classified by the two methods are similar. For the same type of reservoir, not only the capillary pressure curve is similar, but also the micro reservoir parameters are similar. The higher the fractal dimension is, the poorer the reservoir properties of reservoir are, and especially the reservoir heterogeneity is stronger. Through the statistical research of the washing degree of 21 samples, we found that the higher the fractal dimension is, the weaker the washing degree is. And it also further verified the previous conclusion that the higher the fractal dimension is, the poorer the reservoir properties are and the stronger the heterogeneity is.