The 2-mercaptobenzimidazole ethanol (TBE) and mercaptobenzothiazole ethanol(MTE) were synthesized and used as additives in rapeseed oil,a fourball tester was used to investigate their lubrication properties.The results show that two compounds can increase the extreme pressure property of rapeseed oil by 50%,the antiwear and frictionreduction performances of MTE are better than that of BTE in the same condition.The SEM analysis results show that the tribochemical reaction occurs and a complex boundary lubrication film composed of inorganic sulfide and organic nitrogen is formed by the additives in the process of friction,which plays a good role in antiwear and frictionreducing properties.