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By analyzing the traction technologies used in existing locomotives and high speed trains, the development and current situation of traction technology were described, and some urgent problems which need to be solved were presented. Firstly DC motor traction technologies used in Chinese railway were introduced, the development process of DC to AC motor traction locomotives were summarized. Secondly several types of CRH (China Railway High-speed) high speed trains had been compared from the various technical aspects such as main circuit structures, MT ratio, DC link loop. Finally, some studies which should be carried out for the future are presented.