Ceramic materials such as Ti3SiC2 and Si3N4 are potential materials for biofuel engines and functional moving parts.In order to study their tribological properties in alcohol biofuels and lubricants,the reciprocating friction tester was used to study the tribological properties of Ti3SiC2/Si3N4 tribo-pair in linear alcohols with different carbon numbers (ethanol,butanol,octanol and dodecanol) and different hydroxy alcohols (ethylene glycol and glycerol).The results show that the friction coefficient of Ti3SiC2/Si3N4 tribo-pair in alcohols is decreased as the number of carbon atoms and the number of hydroxyl groups increase,and the average friction coefficient varies from 0.06 to 0.11,but the friction coefficient in butanol is the highest (0.25).The wear rate of Ti3SiC2/Si3N4 tribo-pair in alcohols is decreased as the number of carbon atoms and the number of hydroxyl group increase.The wear rate of Ti3SiC2 varies from 4.48×10-7 to 9.33×10-9 mm3/(N·m), and the wear rate of Si3N4 varies from 4.05×10-6 to 2.91×10-7 mm3/(N·m). Among them, Si3N4 has little wear in octanol and dodecanol. The friction state of Ti3SiC2/Si3N4 tribo-pair in alcohols is in the boundary lubrication regime, and the furrow effect of micro-convex and wear debris between the friction interfaces is the main cause of high friction coefficient. Tribochemical reaction is a characteristic of the friction behavior of Ti3SiC2/Si3N4 in alcohols. Tribochemical wear and abrasive wear are the main mechanisms of material wear. The longer the chain length and the more hydroxyl groups, the higher the viscosity of the alcohol, the greater the bearing capacity, so the furrow effect and the wear of the abrasive grains are reduced, and the friction coefficient and wear rate are also reduced.