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A new transition path(γangle deformation path)is put forward and used to characterize the wurtzite-rocksalt transition in AlN.The enthalpy surface and the contour plot of enthalpy difference at equilibrium pressure are obtained by first-principles pseudopotential method within the generalized gradient approximation.The phase transition is needed to overcome two barriers and a metaphase arises between them.The total barrier height is0.26eV.