Abstract: Comprehensive utilization of rice husk resource is important in resolving serious environmental pollutions induced by arbitrary burning and storage of rice husk. Rice husk ceramic (RHC) particles can be a functional addition in developing high-quality and high-performance engine lubricating oils and comprehensively utilizing rice husk resource. In this study, coarse RHC particles were prepared via co-carbonization of rice husk and phenolic resin with a mass ratio of 3:1 for 2 h at 900 ℃ under N2 atmosphere. Then, the particles were ground in a planetary ball mill for 30 min to obtain fine RHC particles. Test oil samples including different contents (0.01%, 0.03%, and 0.05%) of RHC particles were prepared using a conventional magnetic stirring method until particles were uniformly dispersed in liquid paraffin (LP). Effects of different contents of RHC particles on lubrication property of LP including 2% Span-80 were investigated using a four-ball tribometer at 200 N load and 1450 r/min rotation speed for 30 min. Test temperatures of 25, 75, and 100 ℃ were selected to simulate the real engine conditions of initial and high-speed operation. Variations in friction coefficient and average wear scar diameter (AWSD) reflected the anti-friction and anti-wear properties of the different oil samples. Scanning electron microscopy/energy dispersive spectroscopy were used to observe the morphologies of wear traces and detect element contents in the wear zones for the different samples, thereby reflecting the wear form of RHC particles on the surface of friction pairs. X-ray photoelectron spectroscopy was used to detect the variations in the element chemical valence and the element's atom contents in wear zones, and clarify the friction and wear mechanisms of RHC particles in LP under different test conditions. Results showed that friction coefficients did not obviously decrease in comparison with the pure LP, however, all AWSD decreased when different contents (i.e. 0.01%, 0.03%, and 0.05 %) of RHC particles were added into LP at 25 and 75 ℃. Therefore, the anti-wear property of LP was modified at a certain extent. When the temperature was 100 ℃, all average friction coefficients of different contents of RHC particles in LP decreased from 0.139 (LP) to 0.083, 0.064, and 0.069, respectively, and all AWSD decreased from 0.389 to 0.314, 0.311, and 0.318 mm, respectively. The anti-wear and anti-friction properties of the different contents of RHC particles in LP were obviously better than those of oil samples at 25 and 75 ℃. The Si element contentt in the wear zones of different oil samples lubricated with LP + 2% Sp-80 + 0.03% RHC at 100 ℃ was 0.51%, respectively. The Si came from the composition of RHC particles. These results indicate that friction induces RHC particles to participate in the formation of boundary lubricating film under high-temperature condition. The RHC particles can be used as a high-temperature friction-modified additive.