Considering　the　effect　of　nonlinear　factors,　static　response　is　used　as　initial　condition　for　the　dynamic　response　analysis　of　the　underground　structures　under　dynamic　loads.　Since　there　is　zero　frequency　restriction　on　some　local　artificial　boundary　conditions　such　as　transmission　boundary　and　viscous　boundary,　the　initial　condition　of　static　response　cannot　be　directly　applied　to　the　dynamic　system　simulated　by　those　artificial　boundary　conditions.　Fixed　boundary　is　applied　during　the　static　analysis,　and　the　reactive　force　on　the　boundary　is　regarded　as　the　boundary　constraint　force　in　the　stage　of　the　dynamic　analysis.　As　a　result,　the　boundary　conditions　of　static　and　dynamic　analysis　were　not　uniformed.　The　viscous-spring　boundary　without　zero　frequency　restriction　was　applied　to　the　nonlinear　dynamic　response　analysis　of　the　underground　structure　under　dynamic　loads,　by　which　the　uniform　boundary　conditions　between　static　and　dynamic　analysis　were　achieved.　At　last　the　algorithm　was　implemented　in　the　explicit　finite　element　program　LS-DYNA　by　the　example　of　dynamic　response　analysis　of　the　underground　structure　under　explosive　loads.