Studying　the　impact　of　pores　is　crucial　to　enhancing　the　service　performance　of　coatings,　since　they　are　a　typical　microstructure　feature　of　thermal　barrier　coatings.　In　this　paper,　a　coating　prepared　by　the　APS　method　was　employed　as　the　study　object,　and　a　scanning　electron　microscope　and　optical　microscope　were　used　to　calculate　the　porosity　after　spraying　or　high-temperature　exposures.　Based　on　this,　numerical　calculations　and　simulations　were　used　to　evaluate　the　impacts　of　the　pore　structure　and　porosity　on　the　heat　conductivity　and　radiation　characteristics　of　the　coating.　The　results　showed　that,　at　high-temperature　exposures,　the　horizontal　pores　inhibited　thermal　conductivity　and　radiation,　but　the　column　pores　increased　heat　conductivity　and　radiation.　The　heat　conductivity　of　the　coating　linearly　decreased　as　the　porosity　increased,　whereas　the　extinction　coefficient　increased,　although　at　a　slower　and　slower　pace.　When　the　porosity　reached　15%,　if　the　porosity　was　further　increased,　the　thermal　radiation　energy　did　not　change　much,　indicating　that　increasing　the　porosity　would　only　block　the　heat　radiation　to　a　certain　amount.　This　new　and　time-saving　technique　for　materials　research　utilizing　simulation　and　numerical　computing　may　be　utilized　to　optimize　the　microstructure　of　coatings　to　increase　their　service　performance.　©　2023　by　the　authors.