To　reduce　the　power　consumption,　the　technology　about　cache　low　power　was　analysed,　and　a　shared　cache　reconfigurable　method　in　the　multi-core　processors　(CMP)　for　low　power　was　proposed.　First,　the　cache　reconfiguration　necessity　by　the　static　reconfiguration　was　analysed;　Then,　the　reconfigurable　strategy　during　cache　access　was　added.　Result　shows　that　the　method　can　save　about　18%　energy　consumption,　while　the　performance　decline　is　only　4%.