Abstract: As a new electric discharge machining technology, short electric arc machining (SEAM) is essentially a thermal processing, which has great advantages in processing nickel-based superalloy. In order to explore the optimal electrical parameter process combination of SEAM GH4099, this paper creatively established a numerical simulation model of discharge pits for SEAM of GH4099, and studied the influence of voltage, frequency and duty cycle on the morphology of discharge pits, and obtained the optimal electrical parameters for GH4099 processing were determined: 30 V, 1 kHz, 60%, and through designed experiments, the workpiece material removal rate and surface quality under these parameters were verified. This not only enables efficient processing of GH4099 materials, but also promotes the improvement of short arc thermal processing theory.