Aiming at the structure characteristics and performance of asynchronous traction motor for narrow track diesel locomotive, analysis and calculation were carried out in details, and the general technical index and structure parameters were determined. The structure and main technical performance of CDJD113B asynchronous traction motor were introduced, including its structure design principles and its main parameters. Prototype testing and proving results showed that the designed and developed CDJD113B asynchronous traction motor could meet the requirements of the specification with the advantages of good performance and high reliability.