A novel high-power wide-band laser beam shaping method using a fan-shaped quasi-parabolic mirror is exploringly proposed. The design principle and preliminary experimental results of the wide-band beam shaping system based on a fan-shaped quasi-parabolic mirror are presented. According to the geometrical optics, the focusing characteristics of a real beam passing through the beam wide-band shaping system are investigated by ray tracing. It is demonstrated that, after transformed by the wide-band beam shaping system, the original high-power circular laser beam can be shaped into an arc-shaped scanning strip of uniform intensity distribution and large size (20~500 mm). By using a transverse flow CO2 laser, the optical transformation characteristics of the actual wide-band beam shaping system are invested. The experimental and theoretical results are in good agreement.