As　the　multi-core　technology　develops,　the　cache　size　becomes　larger　in　CMP(Chip　Multi-core　Processors),　which　is　attended　as　the　main　factor　in　power　consumption.　How　to　reduce　the　power　consumption　with　no　influence　on　the　microprocessor　performance　is　an　important　problem　to　the　cache　design.　This　paper　researches　the　related　technology　about　cache　low　power　and　proposes　a　shared　cache　reconfigurable　method　in　CMP　for　low　power.　First,　this　paper　analyses　the　cache　reconfiguration　necessity　by　the　static　reconfiguration.　Then　add　reconfigurable　strategy　during　cache　access.　In　the　end,　we　gives　the　experiment　result　that　the　method　can　save　energy　consumption,　while　the　performance　decline　is　little.　©　2012　IEEE.