The performance of combined turbine composing of Darrieus and two stages of Savonius rotor was experimentally investigated to obtain an optimum. This combined turbines with a set of two stages Savonius rotor mounted on the outside of the Darrieus rotor on the same shaft and with single deflector plate in front of returning side of the bucket have higher torque and power coefficient than the solo Darrieus turbine. The increase attains about 18% for power coefficient and about 16% for torque coefficient. We also observe the increase of turbine speed