Abstract: The traditional lubricating oil pollutes the environment,and the petroleum resource is reducing too,so it becomes very significant in both social and economic perspective to develop a new biodegradable lubricating oil to replace the mineral oil.In order to develop the biodegradable lubricants,the rapeseed oil is used for the base oil,with the Sulfur system (T321 and T322) and Phosphorus system (T307) additives,the tribological property is investigated.The experiment result shows that compared with rapeseed oil with T322 and T307,the rapeseed oil with T321 and T307 has,on average,an increase of 7.35% for the maximal non seizer load,an increase of 19.53% for the load at the wear scar diameter of 1.0mm,a reduction of 5.07% for the wear scar diameter under 392N for 30min.So the anti wear property and the extreme pressure of rapeseed oil with T321 and T307 is better than that with T322 and T307.

Key words: lubricant, vegetable oil, anti wear property, extreme pressure property, new energy, energy conservation