ring Technical College,Deyang Sichuanm 618000,China)〖JZ)〗 〖WT8.75HZ〗Abstract:〖WT〗According to the principle of reliability analysis,the mathematics model of reliability of progressive lubrication system units was established.By calculating the reliability of units,the reliability of each unit for the lubrication system was achieved,and the problems,such as adjustment methods of reliability of lubrication units,difficulties of manufacturing process ability,surface hardening of materials and requirements of surface quality were analyzed.The result shows that the different progressive lubrication system has different requirements of reliability of lubrication units.When the progressive lubrication system is designed,by means of allocating the quantity of lubrication units,improving the properties of material and requirement of surface roughness for components of low reliability units and selecting surface hardening methods properly,the ability of resisting the failure for components of low reliability units can be raised so as to meet the requirements of reliability when the system is running.