Abstract: The newly designed ball dropping valve for the reactor shutdown system is a nuclear safety class equipment,and its design needs to be verified through substantial experiments.The control system of the test platform for the ball dropping valve is built to control,survey and protect a testing prototype of the valve’s driving component,and also to provide the methods of data collection and design scheme verification during the test.A control scheme which consists of PLC,stepping motor and position indicator is proposed,the model selection,control principle design and system integration and upgrading have been conducted,and some control circuit and components to be used are fully tested.