The leakage prediction model for gasket static seal is theoretically based on the HagenPoiseuille law.This law is generally appropriate for the prediction of single-component leakage of gas or liquid,while its applicability remains to be further researched for the leakage of bi-component or multi-component media.Considering the hydrophilic and hydrophobic characteristics of leakage channel,the fundamental flow pattern of bi-component media with different densities in capillary was obtained by means of utilizing the Lattice Boltzmann Method (LBM) to simulate the bi-component percolation process in the rectangular microchannel.It is suggested that the hydrophilic and hydrophobic characteristics of the channel have a significant influence on the bi-component percolation,which results in the shrink of cross-sectional area and a slowdown of light component in traffic.The shrink of cross-sectional area arises from heavy component adhering to the hydrophilic wall surface.The results show that the bi-component flow in the hydrophilic wall channel is different from the general bi-component mixed flow,so the formula needs to be modified when using Hagen-Poiseuille law to predict percolation.