Abstract: The special purpose power supply for shunt by transforming uniphase into triphase is an important equipment for accelerating railway speed. To ensure reliable work of the shunt and the safety of the train, this paper offers a test and control system of the special purpose power supply for shunt. The hardware architecture and various functions of the test and control system of the special purpose power supply for shunt are introduced. The work principle of voltage regulator and the design scheme of software are also expounded. Practical test verifies the validity of this test and control system in improving the performance and the reliability of the power supply for shunt.