In view of the problem that the amplitude of pulse voltage changes due to the migration of VHF pulse resonance frequency with the change of circuit impedance, and the bipolar characteristics of VHF pulse make the traditional detection method unsuitable, a VHF EDM discharge state detection method based on inter-electrode partial voltage detection was proposed. The conversion of high frequency and high voltage bipolar pulse to low voltage and single polarity DC signal is realized by the combined action of voltage division, rectifier and filter modules. Meanwhile, the current open-circuit voltage and the change of inter-electrode discharge state can be directly characterized by the detection of DC signal. In the simulation and experimental validation testing method on the basis of feasibility, design discharge condition detection system based on the test scheme and corresponding detection algorithms, successfully verified the micro-nano machining the pulse frequency, VHF automatic optimization technology and the effectiveness of the very high frequency discharge condition detection, is conducive to improve VHF discharge during the process of electrical discharge machining precision.