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Operational test is an important measure which can guarantee safe and stable operation of UHVDC thyristor valves. HVDC thyristor modules can be performed either in a six-pulse back-to-back test circuit or in a synthetic test circuit. UHVDC thyristor valves have a high power rating and are difficult to test in a back-to-back test circuit. A synthetic test circuit can reach a high capacity with few installed capacity. This paper introduces a new synthetic circuit which can present the practical stress of ultrahigh voltage direct current (UHVDC) thyristor valves. Effective tests verify the circuit was successful.