In order to solve the problem of the traceability of the ratio, an electromagnetic harmonic voltage ratio standard has been established based the voltage series addition; meanwhile a wide frequency range capacitive voltage divider is developed based on the compressed gas capacitor and the ratio errors are tested under different frequencies. The test results indicate that the ratio errors of the electromagnetic harmonic voltage ratio standard reach up to 0.02% under ten frequencies of 50Hz, 150Hz…2500Hz, the ratio errors of wide frequencies range capacitive voltage divider are under 0.1%.