Abstract: Based on the comprehensive considerations of the values of power coefficient C_p, torque coefficient C_m and the manufacturing costs of wind rotors, the rotor Model FDG-7 wind pumper was chosen.By the wind tunnel test, the aerodynamic properties shows following results: (1) If blades are in same shape, the aerodynamic properties of the rotors are strongly influenced by the number of blades. The more the number of blade on the rotor occurs, the greater the value of torque coefficient and the less the/power coefficient will be. (2) If the coordination between the chord length of constant chord length blades and the twisting angle is perfect, it will be possible that the aerodynamic properties of constant chord blade rotors will be equal or better than those unconstant chord blade rotors. (3) If the assembling angles of blades on the rotor are same, the new designed constant chord blade rotor is better than those original unconstant chord blade rotors. The torque coefficient of constant one is slightly greater than the unconstant ones.The paper also introduces the testing method on the aerodynamic properties of wind rotor model, as well as the APPLE-IIe computer measurement and control system. Finally, the comparison test results, discussion and conclusion are presented.