The physical properties and processing technology of wild silk fibers, yarns and fabrics have been studied for the promotion of new uses of silk by developing novel fabrics made of fibers of wild silkworms different from those of the domesticated silkworm (Bombyx mori). Although wild silk fibers show advantages such as thickness, bulkiness, compressive elasticity, resistance to chemicals, they display many defects, including shrinkage with hot water, poor cohesion, development of bright specks in the yarn, low dyeing ability, etc. However, we succeeded in pro by combining mori silk with wild silk fibers, and by effectively utilizing the latter’s characteristics for a wider demand of silk products. The mixed twisted yarns produced by the combination of wild silk fibers with mori silk with limited shrinkage enabled to improve the dimensional stability of wild silk fabrics. Also, the use of thick yarn enabled to prevent the occurrence of bright specks. The use of acid milling dyes or reactive dyes for wild silk yarns led to the induction of dark shades and rich, fast colors, especially since it had been hitherto difficult to use reactive dyes for mori silk products and wild silk fabrics.