VDEC(VLSI Design Education Center), which was developed in 1996, is Japanese low cost prototyping service organization for LSI circuit development. University can use commercial CAD tools through VDEC for designing LSI chips. However, it is difficult to use such commercial CAD tools in the beginners' classes of designing LSI because of complicated license management in VDEC. A lot of universities in Europe and U.S.A exploited free-ware CAD tools in the beginners' classes, since they are simple, lightweight, and easy to use. However, in Japan, such tools cannot be used for design LSI chips for VDEC fabrication. Here, an educational system, which supports designing LSI chips with VDEC using only free-ware CAD tools, is developed. This system uses common free-ware CAD tools: Alliance, Magic, Irsim and Spice3, and in order to interface between them, original tools are implemented. For VDEC implementation, Alliance's technology files and libraries, Magic's technology file, and Irsim's library are prepared. As a verification, an 8bits RISC processor is designed. From the evaluation of execution time, it is shown that this system is able to use in the class of designing LSI by using common PCs.