Abstract: Accoding to the principle of continuum mechanics,a class of wave eguations from seismic exploration have been introduced,in this paper,the awthor presents a boundary element method to solve above problems in freguency domain, ths methiod first takes fourier transform of the time variable,changes the wave eguation into the Helmholtz eguation,then solves the eguation with Boundary Element Method in frekency domain,and finae returns the results to the time domain This paper providesa concrete computing formula of the method.