Abstract: The alkli basaltic breccia pipes at the Lutuofeng area are late Tertiary volcanic rocks,composed of breccia,dikes and cones,suggesting a multi-stage volcanism.The sequence of eruption was from alkali olivin-basalts to basanite,olivine nephelites and quartz tholeiites.Based on petrography,mineralogy,major and trace elements,especially on REE and Sr isotopic composition,the petrological characteristics and petrogenetic relation of the basalts have been well discussed.It has been postulated that the alkali olivin basalt-basanite magma requires low-degree(5—8%)melting of the garnet lherzolites,while the olivin nephelites magma may be derived from differentiations of the alkali olivin basalt basanite magma under high pressure in the lithospheric mantle.The quartz tholeiites may be the products of the melts of lithospheric mantle.The author has concluded that the spinel lherzolite xenolith is mantle fragments that were trapped by alkali basalts at a time when they were uprising from the mantle.