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For purchasing more efficiency, more power transmission capacity, UHVDC projects are employed in the gird of China. Thyristor valves, as one of the key equipments, must pass the operational tests in order to make sure the valve design is proper. In coordinate with IEC60700-1 standards and based on thorough investigation and comparison of exiting operational test circuits, a new operational tests circuit is developed and applied in the Ningdong-Shandong ±660kV UHVDC project. In this paper, the topology and working principle of the test circuit are introduced. Then test parameters and results are presented, showing that development of thyristor valves for Ningdong-Shandong UHVDC project is successful.