3D laser scanning radar is one of the most effective sensors in landing guidance, navigation and control. The study of key technologies of lidar are valuable in science and application. A fast 2D scan system is important for 3D lidar. A scheme is proposed for designing the driving and controlling circuit for the scan system by mixing analog and digital method. Based on virtual instrument technology, A test and calibrate system of motor is designed by adopting NI data acquisition (DAQ) board. Through this test system, the non-linear and dynamic performance of scan system is measured. Experimental results show that this scan system can meet the requirement of 3D lidar.