Abstract: A kit of magnetic field system is designed for RKA. This magnetic system is consisted of two components: magnet power supply and magnet field coils. The desirable coil shape is calculated through iterative process, and then the main parameters and scheduling control of the magnet power source are discussed. In the end, the primary test of the magnetic field distribution of the solenoid is carried out. The test shows that the pulse magnet can satisfy the RKA magnetic constrains conditions.