As　a　key　parameter　for　thermal　design　of　civil　buildings,　sol-air　temperature　has　been　defined　in　current　code　(GB50716-2016),　assuming　that　the　exterior　surface　coefficient　of　heat　transfer　of　the　building　envelope　is　constant　and　the　effect　of　sky　long-wave　radiation　can　be　ignored.　Lhasa,　located　at　an　altitude　of　3650　meters,　is　selected　as　a　representative　city.　To　address　the　modifications　due　to　local　wind　speed,　low　air　pressure　and　strong　sky　long-wave　radiation.　The　results　show　that　compared　with　the　values　calculated　by　current　code,　the　sol-air　temperature　in　Lhasa　decreases　by　3.2℃　on　the　vertical　surface　and　7.6℃　on　the　horizontal　surface　during　the　heating　period.　©　2023　IBPSA.All　rights　reserved.