In　the　process　of　blast　wave　numerical　simulation,　the　accuracy　of　blast　wave　propagation　is　strongly　dependent　on　the　size　of　finite　element　mesh　of　air　and　explosive.　Nowadays,　most　of　the　commonly　used　methods　of　blast　wave　numerical　simulation　are　aiming　at　one　certain　equivalent　weight,　thus,　these　methods　have　limitations　in　application.　In　order　to　solve　the　problem,　this　paper　proposes　a　mesh　generation　method　taking　account　of　the　equivalent　weight　and　conducts　amount　of　calculations　by　using　the　finite　element　software　LS-DYNA.　The　results　indicate　that　this　method　provides　not　only　better　applicability,　but　also　higher　accuracy　of　numerical　simulation　by　concerning　computational　efficiency.