Research Conclusions: In order to meet the high requirement of 200 km/h line，the primary countermeasures are proposed for track maintenance，including inspection ， operation ， strengthening management of rail ， track structure， inspection of long slope，large-sized machine maintenance，ballast management ， solving the problems of curve，switch position and slope improperly ， testing and deciding tolerance values of dynamic and static irregularity of 200 km/h line， strengthening person training ， establishing all kinds of systems and regulations，guaranteeing skylight subgrade drainage and well doing the protection work of track. Also the issues necessary for being further studied are proposed，including introduction of large-sized machines and their match，research and development of inspectional and operational tools under static status，finding out the law of preventive grinding ， finding out the law of subgrade settlement in order to guarantee the even of transition area，improving rigidity of bridge against disturbance deformation，taking overall measures in the areas of design，fabricating and construction for improving the regularity of switch structure and switch area and the vibration on bridge and bridge fatigue caused by 200 km/h train.