today　the　power　optimization　has　become　a　crucial　concern　in　modern　IC　design.　Multiple　supply　voltage　(MSV)　is　efficient　way　to　achieve　low　power.　Most　of　the　researches　are　carried　out　in　the　simulated　annealing　scheme.　In　this　paper,　a　novel　particle　swarm　optimization　approach　was　proposed　for　multiple　voltage　islands　generations　at　the　post-　floorplanning.　This　PSO　was　applied　for　resolving　MVA　with　new　operators.　We　have　carried　the　experiments　to　demonstrate　the　feasibility　of　PSO.　Simulation　results　are　shown　to　be　effective　in　voltage　islands　generation.