Sea buckthorn oil (SBO) was extracted by supercritical CO2 extraction,its thermal stability was analyzed by using thermogravimetric analyzer (TGADSC) and was compared with Jojoba oil (JO,a highperformance and ecofriendly lubricating oil).The tribological properties of SBO and JO,and their compound oils after adding the additives of MoDTC and ZnDTP respectively were investigated on a reciprocating friction and wear testing machine of MFTR4000.The worn surfaces of the lower discs were observed and analyzed by optical microscope （LV150N）and energy dispersive Xray spectroscopy (EDS).The results reveal that the heat resisting property and lubricating performance of SBO and the sensitivity to additives of MoDTC and ZnDTP are better than that of JO.Under the lubrication of SBO with additives of MoDTC and ZnDTP,the worn surface of the lower discs is relatively rich in S and P elements,indicating a friction chemical reaction is occurred between S and P elements and the friction surface during the friction process to form ironic phosphate and ferric sulfate film,which improves the friction reducing and antiwear properties of frictional pairs.