In　this　paper　we　use　the　multiphase　multispecies　Lattice　Boltzmann　method　to　investigate　the　influence　of　non　-condensable　gas　on　condensation.　Condensation　on　a　horizontal　cold　wall　as　well　as　that　on　a　vertical　wall　with　droplet　movement　is　investigaged.　The　presence　of　non-condensable　gas　obviously　reduces　the　condensation　mass　rate　as　well　as　the　heat　flux　compared　to　condensation　from　pure　vapor.　The　waiting　time　before　nucleation　is　increased　with　non-condensable　gas,　and　the　wetting　characteristics　are　also　changed　(the　contact　angles　are　increased),　which　further　influences　the　heat　transfer.　Correlations　of　the　relationship　between　droplet　diameter　and　condensing　time　for　different　surface　wettability,　or　contact　angles,　as　well　as　different　air　mass　fraction　are　obtained.　As　for　condensation　on　a　surface　parallel　to　the　gravitational　force,　it＇s　demonstrated　that　the　presence　of　non-condensable　gas　reduces　the　droplet　departure　diameter　and　increases　the　period　between　subsequent　droplet　formation　and　departure.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.