The modeling, design, implementation and experimental verification of dual-wedge scanning system was introduced, which as the key components of the large airborne LiDAR. In order to achieve large size, wide field of view and high precision pointing of dual-wedge scanner system, the dual-wedge which was 16° wedge angle and 320 mm diameter and corresponding PID biaxial scanning control module were designed, and the sources of system error and error control method were analyzed. In the ground test of 45 m away, rotating wedge mirror every 3.6°, for 100 times, companed with the measurement true value, and through calibration and validation, the scanning point error was less than 50 μrad. The flight experiments are carried loading with the integrated airborne LiDAR, the measured scanning field of view is 32.03°, verifies the validity of dual-wedge scanning system in further.