Serious　ash-related　issues　could　occur　during　the　combustion　of　high-alkali　coal.Oxy-fuel　combustion　is　a　promising　combustion　technology　to　deal　with　the　emission　reduction　of　CO2.However,　the　influence　mechanism　of　oxy-fuel　atmosphere　on　the　transformation　of　high-alkali　coal　ash　is　far　away　from　enough.In　addition,　the　previous　study　mainly　adopted　the　high-temperature　ash　composition　as　the　research　benchmark,　which　was　difficult　to　explore　the　inorganic　substances　behaviors　at　low　temperature.This　study　explored　the　impacts　of　combustion　atmosphere,　oxygen　content,　and　additives　on　the　transformation　of　ash　components　via　FactSage　software　on　the　basis　of　the　low-temperature　ash　composition,　also　including　the　element　distribution　in　gas　phase.The　results　showed　that　the　oxy-fuel　condition　benefited　the　vaporization　of　chlorine　at　600　.The　chlorides　and　sulfates　in　the　gas　phase　could　condense　on　the　ash　particle　surface　to　worsen　the　fouling　and　slagging.The　oxides　of　sodium,　calcium　and　aluminum　reacted　each　other　to　form　Na2Ca3Al16O28　at　200　and　the　Na2Ca3Al16O28　was　absent　with　the　increasing　temperature,　which　could　be　put　down　to　the　formation　of　low-temperature　eutectic.The　oxygen　content　had　little　influence　on　the　ash　transformation　of　Wucaiwan　coal.The　high　content　of　CO2　could　accelerate　the　carbonation　of　ash　to　generate　Ca5Si2O7(CO3)2　and　CaMg(CO3)2,　but　had　little　influence　on　the　sulfates.In　addition,　the　addition　of　Al2O3　and　SiO2　could　reduce　the　content　of　CaCO3　in　the　ash　but　exerted　little　effect　on　CaSO4.　©　2021,　Editorial　Office　of　Journal　of　China　Coal　Society.　All　right　reserved.