This paper presents a control and protection system for operational test of ultra high voltage thyristor valves to fully meet the requirement of IEC60700-1 specifications. The system is composed of control and protection hosts, HMI system, control device of converter pulse, analog measurement unit, etc. In this system, there are PCI bus, CAN bus, and TDM bus, which transmit data among functional units. By means of controlling circuit source, voltage source and auxiliary equipments, configuring parameters of converter pulse, switching test items automatically, the system makes the whole test process flexible and stable. The protection system provides comprehensive, effective protection for primary equipments by monitoring the status of the operational test system. The operational test results show that this C&P system is reliable and effective and provide a substantial base and platform for research and development of high voltage thyristor valves and related fields.