Considering the anisotropy of the band mass for holes and the optical phonon mode,and the variation of phonon frequency with wave vector,the ground state energy and binding energy of an exciton in wurtzite GaN/AlxGa1-xN quantum well(QW) are calculated by a Lee-Low-Pines(LLP)variational method.The ground state energy and binding energy of a heavy-hole exciton as functions of well width and Al composition x are given.The ground state energy and the binding energy in a wurtzite GaN/Al0.3Ga0.7N quan...