Characterizing the heterogeneity of pore volume，pore size distribution，and specific surface area is an important task in the evaluation of shale oil exploration. In this study，the multifractal theory was adopted to study the experimental data of low temperature N2 adsorption of Shahejie Formation shale in Dongying Sag. Relationships among multifractal characteristics，fractal parameters，pore parameters and shale mineral composition were discussed. Results show that：the pore size distribution of Shahejie Formation shale in Dongying Sag is characterized by multiple fractal features，and the heterogeneity of the pore size distribution is mainly related to the specific surface area of the pore. The larger the Hurst index indicates the greater penetration rate. There are strong positive or negative correlations among the multifractal parameters except the difference between the right semi-biased parameter and the left semi-biased parameter of multifractal spectrum.Information dimension and correlation dimension are positively related to Hurst index and negatively to Hausdorff dimension，left semi-biased parameter and multifractal spectral peak width，while multi-fractal parameters，such as information dimension and correlation dimension，are positively correlated with the specific surface area and pore volume，and the other multifractal parameters are negatively correlated with the specific surface area and pore volume（except for the right semibias parameter）. There is no obvious correlation between multi-fractal parameters and rock mineral composition.