In view of diesel energy conservation and emissions reduction,a new method of diesel energy saving based on low friction was put forward.Low friction and wear thchnology of diesel engine was studied,surface coating technology and lubrication technology were useded to reduce the wear of frition pairs.Comprehensive test bench of diesel engine energy savingwas designed,fuel consumption and exhaust gas analyzer was used to test the effect of energy conservation and emissions reduction.The results show that the surface coating technology and anti-wear lubricating oil have good energy saving effect,which provides a new method for vehicular diesel engine energy conservation.