The solid lubricant MoS(2)demonstrates excellent lubricating properties, but it spontaneously oxidizes and absorbs moisture in air, and thus results in poor wear resistance and short wear-life. In this study, the additive g-C3N4(CN) was successfully combined with MoS(2)via hydrothermal synthesis as a solid lubricant for the first time. Meanwhile, a low friction coefficient (COF, mu = 0.031) and ultra-long wear-life of CN/MoS(2)compared to pure MoS(2)in air were demonstrated. The functional groups and good crystallinity of the lubricant material were characterized via Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The formed valence states in CN/MoS(2)were analyzed via X-ray photoelectron spectroscopy (XPS). The characterized results of the scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) show the morphology and interior crystal phase structure of CN/MoS2. From the cross- analysis, the presence of iron oxide nanoparticles lubricating film is synergistic with CN/MoS(2)film during the friction process, resulting in its ultra-long wear-life. In particular, the friction mechanism of interlayer sliding friction combined with energy storage friction was analyzed and proposed.