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As technology scales down to nanometer dimensions, static power consumption has become more and more important. We propose a low power method to manage power consumption; it considers dual supply voltage (Vdd) and dual threshold voltage (Vth) at the same time to deal with the scheduling problem in the behavioral synthesis stage. A flexible design space of power, and a better performance can be achieved when we use the proposed method. An algorithm combining GA (genetic algorithm) and SA (simulated annealing) is used to solve the scheduling problem. Experimental results illustrate 41.6% power reduction on average.