This papper is concerned with robust design of a linear DC motor which is steading fast in OA and FA systems due to simplicity in structure high-speed operation and high-precision positioning. The approach is based on the Taguchi method and utilizes the orthogonal way for design of experiments. In this study, first, the important factors are chosen at first. and then the concept of signal-to-nose(S/N) ratio is allied to evaluate the motor performance and each value of the design parameters is determined. This method is useful to robust design in a short time. As a result, the performance of the motor is improved.