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Flow separation is important topic in studying the flow around an airfoil.Flow separation usually can cause vortex structure and vortex shedding which can reduces the lift and lead airfoil to stall conditions.So control of unsteady separation can keep the flow maintain a special topological structure that can prevent stall conditions and provide superior performance.In recently years, adaptive airfoil gain more attention due to its better performance[1.2], and several experiments shows that flexibility of the airfoils might delay the stall and increase performance[3].But because of the complexity of unsteady separation, the mechanism of unsteady separation controlling is still unclear.