: The train door of the high speed train currently operation in Korea is consist of 46 train set(1,656 units) and they are all made up of imports. The problem is that it is difficult to service parts at the right time for breakdown or replacement as parts are imported. Moreover, it is difficult to secure service parts when they are discontinued due to characteristics of imported parts, this leads to an increase in overall maintenance cost. As a result, the Korea Railroad Corporation has developed localization of the high speed train door system and currently progress the on-track test to verify reliability. In this paper, the design and production process of development product and result of performance test are summarized. In addition, the technical improvement of the developed product compared to the existing product was confirmed and the method for securing the reliability was considerate