In this study, we developed silicon nitride with low friction, low wear and high strength for wear resistance parts. And this work is to study the basic synthetic process for ultra fine particles reinforced silicon nitride composites and the fabrication processes of wear resistance parts. The following results were obtained: 1) The basic synthetic and fabrication process for wear parts were almost established, 2) In engine durability test, it has confirmed that the wear resistance could be improved by using developed silicon nitride.