Abstract: In this paper, a new design for relative navigation and communication system integration system was discussed, and a relative measurement and communication integration system of half duplex CDMA based software radio was proposed to realize the integration of relative achieve navigation and inter-satellite communication, and the communication data and navigation measurement data were transmitted in one data frame, sothe new system did not require a separate inter-satellite communication and extra frequency. The system architecture and working principles were described in detail. The system performance was analyzed, and the simulation was done.