Abstract:Starting from the basic principle of spherical wave propagation and through solving the Kirch-hoff integrated formula,the paper analyzed the relation between the curvature radius of spherical wave front and wave field strength during propagation of elastic wave and pointed out the influ-ence of produced equivalent cavity form on seismic wave strength:the amplitude of elastic wave in a direction and equivalent cavity are direct proportional to the curvature radius in that direction.On the basis of the theory the dynamite type and form in practice has been analyzed.It is considered that using long and thin charge column and charge cluster for shooting does not form equivalent cavity having larger curvature radius,so that the effect of increasing explosive energy has not bee nachieved.Therefore,the paper presented the basic methods for reasonable selection of dynamite type and form and made reasonable suggestion on major issues that ought to be considered.