Abstract: Conventional lube oil that are discarded into atmosphere and water and soil due to running off or after deterioration can contaminate resources, damage ecologic environment and its balance. The performances of biodegradable lube oil can meet the requirements of lube oil, and can be degraded by microbial after being discarded without polluting the environment Both the base oil and additives of biodegradable lube oil are different with that of conventional lube oil. The future development trend of biodegradable lube oil is using vegetable oil as base oil and u-sing ashless additives.