Abstract: To make better use of remote data, get technical status and fault information of high-speed EMU, strengthen running safety, remote data ground application system was designed based on operation experience and requirements of EMU CRH3C, CRH380B, and CRH380BL. The overall architecture, logical architecture, physical architecture, functional architecture and key technology of the system were designed in this article. The designed system was running successfully on-line, and had good application effect, which validated that the design was scientific and practical, had important instruction significance to the system construction.