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An easy-to-use pre-processor system through which finite element analysis can be applied to routine design works is needed. We have developed a general purpose pre-processor system to be used for body structures and a number of other automobile parts. It can apply to shell, beams and/or solid structures, and has functions to generate input data, to check structures by drawing and to calculate the section constants of beam elements. It has become possible to discuss the detail design of structures because we could obtain a fine mesh models easily from complicated structures such as a automobile body.