In this study, the performance of a wind turbine is compared with a bare one using wind tunnel results. wind turbines, which consist of a diffuser surrounding the rotor. The duct makes more air flow in rotor plain and as a result augments power production. The blade was fabricated, using armed by glass fiber. Duct is formed sheet metal rolling in slope to have an acceptable appearance. According to BEM design, predicted power the bare turbine is 300W in wind velocity 10 m/s considering due to bearing resistant, rotor inertia, and generator efficiency. Wind tunnel investigation revealed 165W for The evaluation of the system in the wind tunnel showed that the power augmentation of the system compared to the bare one was 37% higher on average. The maximum power augmentation of the turbine was 286W. The rotor 61% more than the bare turbine, which increased the speed of the tip of the blade.