We　study　packet　delay　distribution　under　different　types　of　traffic　being　carried　in　the　network　and　different　network　load　in　this　paper.　It　is　generally　believed　that　network　delay　is　mostly　affected　by　two　factors:　network　load　and　types　of　traffic　being　carried.　So,　in　this　paper,　we　try　to　characterize　how　delay　can　be　affected　by　these　two　factors.