Real　networks　often　undergo　over-loaded　traffic,　which　will　cause　congestion　or　even　cascading　failure.　The　limited　capacity　and　the　process　rate　of　network　nodes　may　cause　performance　degrade　and　serious　delays.　This　paper　analyzes　the　effectiveness　of　remitting　congestion　through　upgrading　the　hardware　of　networks.　The　simulations　show　that　congestion　in　a　weighted　scale-free　network　is　affected　by　its　scale-free　feature　and　this　simple　way　to　ease　the　congestion　effects　is　very　significant.　It　shows　that　control　only　a　small　number　of　key　nodes　can　get　the　similar　effect　of　controlling　all　network　nodes.