Abstract: The magnetic system is the leading and necessary equipment of the accelerator. It is composed of magnetic focusing system and scanning magnet. As the main parts of the accelerator, the magnetic field calculation and analysis must be carried out carefully to control the envelope during acceleration. Six solenoids were developed to achieve the request of design, and the radial uniform range of solenoid is 4 cm. The scanning magnet was separated for assembling simply. The scanning uniformity can achieve 92%, the scanning width is ±334 mm, and the scanning frequency can be changed from 5 s^-1 to 15 s^-1. The technology parameters of the magnet system reach the design value and are satisfied with the request of engineering. The magnet system works with low failure rate and high efficiency up to the present.