2-D scanning system with double mirrors of a traditional wind light detection and ranging(LiDAR) was large in volume and complex in structure, which was not conducive to the small-scale integration of the system. A new 2-D optical scanning system based on rotating double circular wedge prism was studied. The working principle of the system was analyzed, and the simple forward and inverse functional relationship between the rotation angle of the double circular wedge prism and the azimuth and zenith angle of the outgoing beam was derived. The refractive index and wedge angle of the wedge prism were optimized and designed. The results show that when the working wavelength is 532 nm and the refractive index of wedge prism material is 2.03, the optimal wedge angle is 19.5°. The maximum zenith angle of the outgoing beam depends not only on the refractive index and wedge angle of the wedge prism, but also on the beam compression effect. The system is compact and easy to integrate, and large-scale, fast and high-precision scanning of the outgoing beam can be realized. The wind LiDAR can also work in beam scanning modes such as plane position display and distance height display.