Abstract: This paper describes the technique targets and operation principle of the scanning power supply for the deep tumor therapy facility with heavy ions in CoolerStorageRing of the Heavy Ion Research Facility in Lanzhou (HIRFLCSR). To ensure the specified accuracy of the current, the hysteresis loop control strategy was adopted, and tracking error was constrained in the specified tolerance. One prototype was designed and installed. And the simulation results and test results were listed in the paper. The results show that all the targets can meet the design requirements, and that the circuit configuration and hysteresis loop control strategy selected are practicable.