Abstract: Unconventional oil and gas reservoirs represented by tight sandstone are complicated in porous space, leading to a long period of rock physical measurement at a high cost and making it difficult to quantitatively study the influence of micro parameters on resistivity. Simulation technology for digital core physical properties developed on the basis of the X-ray CT scanning makes up for this deficiency. This paper systematically summarizes the advantages and disadvantages of various kinds of numerical simulation methods for digital core electrical properties, such as Lattice Boltzmann method, Kirchhoff circuit node method, the random walk method and the finite element method. It also discusses four main problems currently existing in numerical simulation study of electrical properties – (1) lack of models for simulation of more micro factors; (2) contradiction between resolution and heterogeneity of reservoir; (3) limitation of image segmentation method; (4) multiple solutions of digital pore network. It also points out four development orientations for digital-based core property simulation – (1) construction of fine 3-D pore network model; (2) image processing based on multiple threshold segmentation method; (3) optimization of electric simulation model; (4) high-performance parallel computing technology based on digital core. This study will help improve numerical simulation of tight sandstone electrical property and lay a solid foundation for exploration and development of unconventional reservoirs.