In the Panxi rift zone, the Late Permian volcanic formation in the Longzhoushan area is composed of four volcanic cycles; the lower tholeiitic basalt member, the tephri-phonolite member, the trachyt-basalt member and the upper tholeiitic basalt member. Both the lower and upper basalt members are similar to the Emeishan high-Ti flood basalts which occur outside the Panzi rift zone. On the other hand, the tephri-phonolite member with a thickness over 1000 m includes phono-tephrite, tephri-phonolite, phonolite, latite and trachyte, and is lithologically similar to the plateau flood phonolite in the Kenya rift zone, Africa. It is proposed that the lithological association and sequence observed at Longzhoushan may have resulted from the composite action of mantle plume and continental rifting.