The Raobazhai ultramafic massif,which exposed in the north Dabie,is thought to be a segment of subcontinental lithospheric mantle that was subducted and exhumed during the Triassic collision.Study on these ultramafic rocks can provides intriguing information on geodynamic processes and material fluxes between mantle and crust during continent-continent collision,including the stages of subduction and exhumation.