High　rock　slope　is　a　common　type　of　slope　in　mountainous　areas　during　highway　construction,　and　the　issue　of　its　stability　has　been　closely　followed　by　geotechnical　research　scholars.　Based　on　research　of　the　blasting　vibration　and　its　effect　during　the　excavation　of　cutting　slope,　the　analytical　methods　and　the　evaluation　criteria　of　the　high　rock　slope＇s　dynamic　stability　were　discussed.　Taking　Yanqing-Longqingxia　road　reconstruction　project　as　the　background,　a　finite　element　analysis　model　of　the　dynamic　response　of　high　rock　cutting　slope　under　the　load　of　explosion　was　established　and　the　explosion＇s　influence　on　the　dynamic　stability　of　upper　bench　slope　during　the　excavation　of　lower　bench　slope　with　different　blasting　design　parameters　and　different　slope　design　types　was　discussed.　The　results　of　the　detailed　research　indicated　that　the　particle　vibration　velocity　of　slope　strikingly　decreased　when　using　cushion　blasting　technology　and　suitable　design　degree　of　slope,　and　the　influence　of　blasting　on　the　cutting　slope　stability　was　effectively　controlled.