New Jacobi elliptic functions are applied in Jacobi elliptic function expan
sion method to construct the exact periodic solutions of nonlinear wave equ
ations. It is shown that more new periodic solutions can be obtained by thi
s method and more shock wave solutions or solitary wave solutions can be go
t at their limit condition. (C) 2001 Elsevier Science B.V All rights reserv
ed.