Tert-butanol　is　a　good　additive　for　improving　gasoline　performance,　but　as　two　of　the　most　important　thermodynamic　properties,　the　critical　temperature　(T-c)　and　critical　pressure　(p(c))　of　tert-butanol　and　alkane　systems　have　not　been　studied.　In　this　work,　the　experimental　data　of　the　T-c　and　p(c)　of　five　binary　systems　(tert-butanol　+　cyclohexane,　tert-butanol　+　n-hexane,　tert-butanol　+　n-heptane,　tert-butanol　+　n-octane,　and　tert-butanol　+　nnonane)　and　a　ternary　system　(tert-butanol　+　n-heptane　+　n-octane)　were　obtained　using　a　flow　method.　The　T-c　and　p(c)　of　the　binary　systems　were　fitted　using　the　Redlich-Kister　equations　with　maximum　average　absolute　relative　deviations　(AARDs)　of　0.19%and　0.36%　for　T-c　and　p(c),　respectively.　The　T-c　and　p(c)　for　tert-butanol　+　n-heptane　+　n-octane　were　correlated　by　Singh　and　Sharma＇s　equations　and　Cibulka＇s　equations　with　AARDs　less　than　0.09%　and　032%,　respectively.　The　experimental　data　of　T-c　and　p(c)　were　also　used　to　verify　and　improve　the　accuracy　of　our　previous　prediction　model.　Published　by　Elsevier　B.V.