Abstract: This paper introduces a new type of pitch adjustment device which can be applied to small wind turbine. In order to verify the feasibility of its high wind speed operation,the influence characteristics of pitch angle on the output power of small wind turbine are analyzed,the control law of pitch angle when maintaining constant power output and the actual load on the pitch mechanism are researched. A prototype model was tested in wind tunnel. The test results show that the operation of the new type pitch wind turbine is safe and reliable in the test wind speed range of 5～20 m/s. When the pitch angle is 6°,the output performance of the wind turbine is the best. No matter the pitch angle continues to increase or decrease,the output performance decreases. When the wind speed is constant,the output power of the wind turbine decreases approximately linearly with the increase of the pitch angle,and the higher the wind speed,the more significant the influence of the pitch angle change on the output power. The relationship between pitch angle and wind speed when the output power of wind turbine is controlled near 1400 W is obtained. When the constant power output is maintained,the load of pitch rod is significantly lower than that of constant pitch wind turbine.