In order to ensure that filters and var compensators of ±660 kV converting station in EastYinchuan run safely, reliably and stably, using a high frequency test method completes‘H’bridge un?balanced current tests for filters and var compensators of ±660 kV converting station in East Yinch?uan. Unbalanced current and unbalanced value obtained by test and calculation both meet the rele?vant requirements. The result shows that high frequency test method operates conveniently and safely,calculates simply, and can measure‘H’bridge unbalanced current accurately.