In　recent　years,　with　the　rapid　developments　in　the　technology　of　diode　lasers,　diode-pumped　all　solid　state　red　laser　is　widely　accept　as　a　highly　reliable,　compact　and　efficient　source　for　image　projection　and　pumping　tunable　Cr:LiSAF　lasers.　Although　the　different　application　area　needs　different　laser　characteristics,　most　application　field　requires　high　beam　quality　and　high　power　output,　especially　in　large　image　projection　system.　In　this　paper　we　focus　on　how　to　improve　the　output　power　of　red　beam.　What＇s　more,　to　avoid　two　wavelength　operation　which　may　cause　a　problem　for　frequency　doubling　and　obtaining　high　output　power,　we　placed　a　solid　etalon　into　the　laser　cavity.　And　the　experiment　results　demonstrate　that　the　proposed　method　can　avoid　the　damage　of　the　end　surface　of　the　KTP　and　improve　the　stability　of　the　output　power.　Finally,　we　obtain　a　maximum　single　end　output　power　of　6.4W　operating　at　a　single　wavelength　of　660nm　with　an　instability　about　±1%.　©　2011　IEEE.