| With the development of industrialization all over the world, more and more people live in the city. They make the urban transportation rather jam. A suitable transportation model is being looked for. The light transit with the advantages such as huge capacity, little pollution, saving power, relatively small investing and short construction cycle has been adopted widely, especially the 100% low floor light rail vehicle which provides more convenience to the children and handicapped have been developed quickly. About 30 styles of the 100% low floor light rail vehicle were produced by the main manufactures in the world. The R & D of 100% low floor light rail vehicle has been started in several domestic manufactures in order to satisfy the domestic requirement. So it is worthy of important theory significance and wide application of value to research the structure style and the steering principle of the 100% low floor light rail vehicle by using for reference abroad.Firstly, a general development situation of the 100% low floor light rail vehicle was expatiated in the paper. And the structure style and steering principle were put forward as two key problems. Then an analysis of the inland and overseas research actuality was made. It is necessary to do the research of the structure style and steering principle of the 100% low floor light rail vehicle in order to develop the domestic 100% low floor light rail vehicle. Secondly, the structure style of the 100% low floor light rail vehicle all over the world was compared in the paper. And a suitable structure style was confirmed with the operation experience abroad. Thirdly, the steering principle of the 100% low floor light rail vehicle was introduced in the paper. And two suitable styles of bogie were brought forward after a comparison was made by the soft SIMPACK. Finally, a dynamics simulation analysis of the 100% low floor light rail vehicle was made in the paper with SIMPACK.
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