The percolation characteristics of the core determine the distribution of oil and gas and storage information. Using digital core technology to establish the pore network model is very important for the simulation and percolation analysis of the true core pore structure. The macroscopic percolation characteristics of the pore structure are determined by their microscopic characteristics, so it is important to study the characteristics of the percolation path. In order to analyze the seepage characteristics of the pore structure on the microscopic level, the search algorithms of the connected path and the percolation path are studied. Then, the definition and calculation formula of the relevant parameters of the percolation path characteristics are put forward. Finally, the path search results of the pore network model and the percolation path characteristic parameters are presented.