The typical Mesozoic floras are mainly composed of Filicopsida, Cycadopsida, Ginkgopsida and Coniferopsida, as well as some Bryophyta, Lycopdopsida, Sphenopsida and other seed plants. The palaeoclimatic implications of main fossil plants of the Mesozoic except the angiosperms are dealt with in this paper based on their morphologic and anatomic features, taphonomic data, geographic distribution and comparisons with their living affinitive groups. The Mesozoic plants with palaeoclimatic significances are roughly divided into four groups. The first one, which represents temperatehumid climate, consists of bryophytes;LycopoditesandSelaginellites of lycopods; sphenophytes; ferns including the Early Cretaceous Dicksoniaceae,Ruffordia of Schizaeaceae, Osmundaceae andCladophlebis with large pinnules, monolete spore ferns, the main elements of the Ginkgoales;conifersincludingAthrotaxoites,Cunninghamia,Elatocladus,Swedenborgia, Cephalotaxopsis,Sequoia,Taxus,Torreya, Ferganiella, Podozamites, andetc..The second group mainly includes the Pinaceae of conifers and some of Ginkgopsida, especially the Czekanowskiales, which usually indicate a moderatecool climate. The third group indicates warm tropical and subtropical climate, which mainly consists of ferns, such as Schizaeaceae, Marratiaceae, Matoniaceae, Dipteridaceae, Cyatheaceae, Gleicheniaceae and the possible sinopteridaceous fernOnychiopsis and most of the Cycadales and Bennettitales. The fourth group adapted to warmarid climate is represented chiefly by the lycopodPleuromeiaand Isoetites; fernWeichselia; Bennettitales, such asOtozamites,Zamites,Ptilophyllum,Tyrmia, andetc; the Cheirolepidaceae includingPseudoflenelopsis,Flenelopsis,Hirmeriella and the possible cheirolepidaceous conifersBrachyphyllumandPagiophyllum; cupressaceous coniferCupressinocladus; as well as the possible desert plantEphedrites.