Municipal　solid　waste　incineration　(MSWI)　process　has　advantages　such　as　high　capacity　reduction　rate,　fast　processing　speed　and　in-situ　incineration.　Under　un-stable　operational　conditions,　especially　furnace　temperature,　the　emitted　pollution　such　as　SO2,　NOX,　HCl　and　dioxins　may　exceed　national　emission　standards.　In　order　to　obtain　the　relationship　between　the　control　variables　and　the　incinerator　temperature,　3D　numerical　simulation　for　an　actual　MSWI　process　in　Beijing　is　carried　out.　The　structure　of　the　incinerator　is　described　and　its　3D　CFD　model　constructed.　The,　the　baseline　working　condition　experiments　is　made　based　on　the　actual　process　parameters.　The　influence　of　primary　and　secondary　air　and　their　ratio　to　the　temperature　field　are　analyzed.　These　results　can　provide　support　for　the　optimization　control　of　the　actual　MSWI　process.　©　2023　IEEE.