With the rapid development of new-type weapons

the demand for the efficiency of defense layer becomes higher and higher in current civil protective construction. The focus of this paper is primarily on the attenuating and screening stress-waves by using cavities embedded in defense layer. Based on a great many numerical calculations

it has been found that the weakening amplitude of stress-waves behind certain artificial cavity is clearly different if the size dimension and geometry shape of the cavities are changed. Besides

two approximately fitted formulae for the decay factors of peak σy

towards the circular and rectangular cavity are put forward

which can be used to estimate the value of decay factors (DF) at one specific place or the size dimension of cavities under certain conditions; and even can predict the minimum safe distance in order to reach expected attenuating effect. All those can be referenced for the design of intelligent defense layer in anti-explosion engineering.