In　order　to　characterize　the　mesoscopic　seepage　of　pore　spaces　within　undisturbed　granite　residual　soil　(UGRS).　The　2D/　3D　pore　models　of　UGRS　were　reconstructed　using　computed　tomography　(CT)　scanning　and　image　processing　technology.　The　lattice　Boltzmann　method　(LBM)　was　employed　to　simulate　the　seepage　displacement　process　and　water　distribution　in　UGRS　pores　through　programming.　Results　indicate　that　isolated　pores　have　minimal　impact　on　seepage　outcomes.　Only　a　few　large,　straight　pores　with　good　connectivity　become　dominant　channels,　generating　preferential　flow.　Throughout　the　seepage　process,　the　maximum　velocity　in　the　dominant　passage　shifts　from　the　inlet　to　the　middle　and　then　to　the　outlet　region.　The　influence　of　pore　structure　characteristics　on　seepage　is　more　significant　than　pore　proportion.　Using　industrial　CT　scanning　technology　and　LBM　provides　a　better　description　of　real　soil　pore　flow.　The　2D　model　intuitively　illustrates　the　preferential　flow　phenomenon　of　macropores,　suitable　for　qualitative　research.　The　3D　model,　closer　to　reality,　accurately　calculates　soil　permeability,　making　it　suitable　for　quantitative　research.　©　2024　Editorial　Board　of　Journal　of　Basic　Science　and.　All　rights　reserved.