Based on equations of fluids nachanics, introducing new scale hypotheses, and by means of pertubative multiple-scale method, the governing equation and solution of non-propagating soliton wah counting of excition and damping are given. By damping analysis, the curves of the lower cut-off excited amplitude△ｃ versus the excited frenquency Ω and the soliton equalamplitude curves in △－Ω picture in a good agreemant with experiment to a certain extent are obtained.