Abstract: Aluminum alloy and steel are important aviation materials, which is widely used in fields such as aerospace and shipbuilding. Fretting wear results in a significant reduction in the service life of numerous components and premature fatigue failure. Through experiments, this paper verifies that diamond-like carbon （DLC） coatings possess advantages such as high surface hardness, low friction coefficient, and excellent wear resistance, demonstrating outstanding fretting wear performance. Although the fatigue performance of DLC coatings is superior to that of unplated stainless steel bolts, it still lags far behind that of hard chromium-plated coatings and is thus not suitable as a coating for load-bearing components.