The　impact　of　blasting　effect　is　an　important　factor　of　dynamic　stability　in　the　excavation　of　rock　slope.　Based　on　the　sub-grade　engineering　in　Jin-hai　Lake　of　the　New　Countryside　Construction　Project,　this　paper　sets　up　a　finite　element　analysis　model　for　the　dynamic　response　of　the　cutting　slope　under　the　blasting　loading.　It　discusses　the　stress　field,　displacement　field　and　the　propagation　law　of　the　blasting　seismic　wave,　and　analyzes　the　security　evaluation　criteria　of　the　dynamic　stability　of　cutting　slope.　What＇s　more,　it　makes　a　systematic　analysis　on　the　effects　of　blasting　excavation　on　the　stability　of　the　cutting　slope　according　to　blasting　vibration　monitoring.　The　research　provides　referential　value　to　form　a　correct　understanding　towards　slope　damage　caused　by　blasting　excavation.