Abstract: With the ever-increasing needs of high power diode laser source,it is important to obtain symmetric diode laser beam with high power so that a kind of beam-shaping technique with isosceles right-angled prism group has been used to achieve this aim.The experiment presents that the beam-quality is nearly equal for both the fast and slow axes,and the reshaping efficiency is up to 90%.Diode lasers with improved beam-quality can be applied as the pumping source in many high-power solid lasers and fiber lasers.