Dropwise　condensation　on　rough　surfaces　enhanced　with　pillars　in　the　presence　of　non-condensable　gas　(NCG)　including　the　initial　nucleation　process　is　simulated　using　the　multispecies　multiphase　lattice　Boltzmann　method,　and　the　effect　of　mass　fraction　of　NCG,　the　surface　wettability,　the　bottom　wall　temperature　and　the　geometrical　parameter　(the　pillar　height　H)　on　condensation　process　are　investigated.　It＇s　found　that　these　four　factors　all　have　an　effect　on　the　nucleation　position,　waiting　time,　condensate　behaviors,　and　the　wetting　state　of　the　droplet.　With　higher　values　of　NCG　mass　fraction,　surface　hydrophobicity,　pillar　height　H,　and　lower　bottom　wall　temperature,　the　nucleation　occurs　on　top　of　the　pillars　and　the　waiting　time　before　nucleation　gets　longer.　It＇s　also　concluded　that　the　wetting　state　of　the　droplet　tends　to　be　the　Cassie　state,　and　the　average　heat　flux　gets　smaller　with　higher　values　of　the　former　three　parameters　and　lower　bottom　wall　temperature.　©　2020　Taylor　&　Francis　Group,　LLC.