| After the 20th century, the watchword about vehicles adapting railway was put forward in many developed countries in order to make their railway transports be incincible position in competing with other transports, and the titling train was hoted researched. By making great effort more twenty years, the titling technology is gradually matured and widely used.China is very large, there are a lot of railway in mountains, adopting titling train became an important way to improve speed at the existing railway. Therefore, the Fund Committee of Natural Science and the Ministry of Railways successively establish especial item to be researched, and titling train was developed in china.The bogie is an important part of a vehicle, its structure effects the passenger car s performance. In the thesis, on the basis of succeed experience about tilting train bogie abroad, a project of a bogie with flexible primary suspesion for titling EMU is put forward. The gist of selecting type was introduced in detail, and the design schemes of collectivity structure and frame were recommended.The forces of frame are very complexed because of its functions such as orienting wheelsets, supporting tilting mechanism, car body and hanging equipment, transferring traction force, braking and tilting forces, and fixing appurtenances. The swing bolster is the key part that can complete the titling function, and it bears the forces from carbody. In the paper, the force state about the frame and swing bolster are detailed and their structure are analyzed by using the ANSYS program. The frame and swing bolster's optimum tructure are confirmed.Finaly, according to the the temporary criteria for the strength design and test accreditation about the passenger car that can run at 200km/h speed or upwards, intensities of the frame and swing boster are analyzed. The results show that their intensities meet the requests.The study provided a theory gist for developing a bogie for titling EMU at 200km/h speed.
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