Bubbly　flows　in　the　horizontal　channel　or　pipe　are　often　seen　in　industrial　engineering　fields,　so　it　is　very　necessary　to　fully　understand　hydrodynamics　of　horizontal　bubbly　flows　so　as　to　improve　industrial　efficiency　and　to　design　an　efficient　bubbly　system.　In　this　paper,　in　order　to　fully　understand　mechanisms　of　phase　distribution　and　liquid-phase　turbulence　modulation　in　the　horizontal　channel　bubbly　flow,　the　influence　of　gravity　level　on　both　of　them　were　investigated　in　detail　with　the　developed　Euler-Lagrange　two-way　coupling　method.　For　the　present　investigation,　the　buoyance　on　bubbles　in　both　sides　of　the　channel　always　points　to　the　corresponding　wall　in　order　to　study　the　liquid-phase　turbulence　modulation　by　bubbles　under　the　symmetric　physical　condition.　The　present　investigation　shows　that　the　gravity　level　has　the　important　influence　on　the　wall-normal　distribution　of　bubbles　and　the　liquid-phase　turbulence　modulation;　the　higher　the　gravity　level　is,　the　more　bubbles　can　overcome　the　wall-normal　resistance　to　accumulate　near　the　wall,　and　the　more　obvious　the　liquid-phase　turbulence　modulation　is.　It　is　also　discovered　that　interphase　forces　on　the　bubbles　are　various　along　the　wall-normal　direction,　which　leads　to　the　fact　that　the　bubble　located　in　different　wall-normal　places　has　a　different　wall-normal　velocity.