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This paper investigates the machining performance of BaTiO₃ using the electrical discharge machining (EDM) process. The Taguchi orthogonal array technique is used for experimental design. A surface roughness model of the EDM process of semi-conductor BaTiO₃ can be obtained by regression of the experimental data. A genetic algorithm is used to calculate the machining parameters of the optimum surface roughness. To obtain a better surface roughness, positive polarity machining should be chosen in the EDM process of BaTiO₃, whilst the current cannot be selected at too great a value or the workpiece may be broken during the process.