Abstract: Partial discharge test is a mandatory inspection item for factory and type tests of AC power cables ranging from 6 kV to 500 kV, and it is also one of the important means of verifying the quality of power cables manufacturing. Accuracy of partial discharge testing system directly affects the test results. JB/T 10435—2004 Inspection Methods for Partial Discharge Testing System of Electric Cables serves as the dedicated verification method standard for cable partial discharge testing systems, which is the sole basis for determining whether partial discharge testing systems in electrical cable industry could be deemed qualified. Technical changes before and after the revision of JB/T 10435—2004 and their impacts were elaborated in detail, aiming to enhance the applicability of partial discharge testing systems for cables.