<正> Using ab initio plane-wave pseudopotential density functional theory method,we have studied the structuraland thermodynamic properties of the wurtzite boron nitride (w-BN).Through the quasi-harmonic Debye model,in whichthe phononic effects are considered,the dependencies of the normalized lattice parameters a/a_o and c/c_o,the axial ratioc/a,and the normalized primitive cell volume V/V0 on pressure P and temperature T are investigated.Furthermore,the Debye temperature Θ,the variation of thermal expansion α,as well as the heat capacity Cv as functions of P andT are studied systematically.