Starting from the demand of Argentine railway market development, the necessity of establishing a technical platform for export of Argentine DC electric drive freight diesel locomotive was demonstrated. Focusing on the principles of platform building,the overall layout of the technical platform, the technical platform building and simplified design of each system, the technical platform of the whole product and the main performance parameters of three typical types of locomotive were introduced. It was established the foundation for reducing the production cost to increase benefit, uniform standard, expanding the market and offered a useful reference for the future product platform through accomplishing the product platform on group corporation side.