The　stability　of　rock　blocks　near　the　underground　opening　may　be　influenced　by　the　impact　loadings　caused　by　either　natural　hazards　or　man-made　disasters.　This　paper　addressed　the　dynamic　response　of　the　rock　blocks　under　impact　loadings.　The　experimental　tests　were　carried　out　to　record　the　movement　as　a　function　of　vibrations　using　the　impact-induced　rock　burst　system.　Granite　blocks　were　placed　in　the　steel　frame　and　loaded　to　the　designed　quasi-static　condition　at　first.　Permanent　jumps　of　displacements　toward　the　opening　were　observed　after　the　pulse　loading　was　applied.　Analytical　investigations　were　carried　out　to　understand　the　macroscopic　friction　during　the　vibration　progress.　The　results　showed　that　the　friction　force　was　reduced　by　4%　due　to　the　pulse　loading　in　the　orthogonal　direction.　The　friction　angle　at　the　block　boundary　was　also　determined　and　further　adopted　in　the　DDA　models　which　were　built　to　understand　the　micro-friction.　Three　zones　were　determined　in　the　model　based　on　the　uneven　distributions　of　stresses　in　the　potential　sliding　block:　the　concentration　zone,　the　transition　zone　and　the　active　zone,　from　the　opening　to　the　inner　place.　Consequently,　the　variations　of　stress　and　displacement　as　the　function　of　the　vibrations　in　the　three　distinguished　zones　were　presented　to　show　the　dynamic　response　of　the　stressed　rock　block.　The　results　showed　that　the　direction　of　the　major　principal　stress　was　turning　to　be　vertical　in　the　concentration　zone　which　was　favorable　for　self-stabilization　during　the　impact　loading.　Dynamic　responses　of　stressed　rock　blocks　were　tested.Analytical　investigations　were　carried　out　to　understand　the　macroscopic　friction.DDA　models　were　built　to　examine　the　microscopic　friction.