In　this　paper,　we　propose　a　method　to　enhance　the　steady-state　entanglement　between　cavity　fields　and　mechanical　modes　by　injecting　atomic　media　into　the　cavities.　The　atomic　medium　interaction　with　the　cavities　can　change　the　effective　decay　rate　of　the　photons　and　the　radiation　pressure　of　the　cavity　fields　on　the　two　mirrors.　Thus　it　provides　us　with　a　way　to　enhance　the　quantum　entanglement　in　the　optomechanical　system.