Nowadays,space missions become especially complex and time lasting,which requires high reliability and long lifetime of the components in space equipment.The reliability and service life of frictional parts in space equipment becomes the critical factors that directly affect the result of space missions.The motion states of the major frictional parts in space equipment were summarized,it was indicated that those parts,which have relatively broad speed and load ranges,are always in a status of continuous work,multitimes “startstop” or intermittent operation.The main space environment factors that directly influence the friction,wear and lubricant problems were analyzed,i.e.,high vacuum,rapid temperature changing and extreme temperature,intense radiation,atomic oxygen,microgravity,micrometeor and space debris.It was suggested that,indepth study on space environment effect and space lubricating materials are necessary for China in future to largely increase the service life and reliability of frictional parts in space equipment.