With the requirement of 'high efficiency, precision, flexibility and green manufacturing' processing of modern cutting technology, PCD materials have been widely used. EDM is part of the effective methods to process PCD materials. Single pulse discharge grinding is one of the bases for studying the mechanism of EDM. Choose 2 micron particle sizes of PCD compact as processed material, the duration of the research on EDM single pulse discharge on the material removal efficiency (such as the radius of the corrosion pit, corrosion pit depth and the ratio of radius, etc.).The test results show that, with the increase of the discharge duration, the radius of the discharge pit increases rapidly, then slowly increases, and finally flattens out. The radius of the heat affected area increases rapidly and then increases slowly. With the increase of the duration of discharge, the ratio between the depth and the radius of the pit is changed in the range of 0.1~0.25, which is basically decreasing. With the increase of pulse duration, the discharge pit radius increases rapidly, and finally becomes flat. The radius of the affected zone first increases rapidly and then increases slowly.
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