China railway long in China transportation system plays a key role in, and because of technical and economic characteristics of railway, the development of the cause of the railway implementing sustainable development of China's current Along with the development of national economy, its momentum transportation demand driven, especially of railway freight and passenger market demand more This not only stimulated the development of undertakings of railway construction, but also promote the railway equipment update, the quality requirements of railway system also wants to add to The advantages of jointless-track is smooth, passenger trains, comfortable, train speed greatly shorten the transportation time, extend the service life, reduce line equipment, the train operation, saving material, reducing resistance maintenance cost, These advantages are met the requirement of China railway development, China is developing jointless-This design is the DK148 line (chongqing DK150 + +000-2000) rail structure and roadbed First use of ansys software of track structure design, use common jointless-track and relevant calculation, Then finish the roadbed conditions and roadbed design together, satisfy requirement of roadbed reinforcement design force, Then simply introduces jointless-track maintenance operation method, 3 + 1 summarizes the practical results through examples, outside the line maintenance and bed diseases were also Through the design of jointless-track had higher levels of understanding, and understand the various types of track structure, Mastering the excavation method and dredging filling roadbed reinforcement design and improved Through 3 + 1 outside the line maintenance operation practice of various methods, requirements and technical indexes have new knowledge, and its