Particle-fluid　and　particle-particle　interactions　can　be　widely　seen　in　lots　of　natural　and　industrial　processes.　In　order　to　understand　these　interactions,　two-dimensional　fluid　flowing　around　and　through　nine　porous　particles　was　studied　in　this　paper　based　on　the　lattice　Boltzmann　method　due　to　its　simplicity.　Uniform　spatial　distribution　and　random　spatial　distribution　were　considered　and　the　effects　of　Reynold　number　(Re),　Darcy　number　(Da),　and　the　distance　between　the　particles　(dx　and　dy)　on　the　flow　characteristics　were　analyzed　in　detail.　The　investigated　ranges　of　the　parameters　were　10　＜=　Re　＜=　40,　10(-6)　＜=　Da　＜=　10(-2),　D　＜=　dx　＜=　4D　and　D　＜=　dy　＜=　4D　(D　is　the　diameter　of　the　particles).　For　uniform　spatial　distribution,　it　is　observed　that　when　dx(dy)　increases,　the　interactions　between　the　particles　become　weak　and　the　fluid　can　flow　into　the　spacing　between　the　particles.　Besides,　the　average　drag　coefficient　(C-Dave)　increases　with　dx(dy)　increasing　at　Re　=　20　and　the　increase　rate　gradually　slows　down.　Furthermore,　the　distance　change　in　the　direction　vertical　to　inflow　direction　has　more　obvious　impact　on　the　average　drag　coefficient.　For　example,　for　Re　=　20　and　Da　=　10(-4),　when　dx　equals　D　and　dy　increases　from　2D　to　3D,　C-Dave　increases　by　5.79%;　when　dy　equals　D　and　dx　increases　from　2D　to　3D,　C-Dave　increases　by　2.61%.