Abstract: According to the characteristics of space communications,the Consultative Committee for Space Data Systems(CCSDS)developed SCPS(Space Communications Protocal Specification) protocol set.The application of CCSDS recommendations in China,and the practical application of CCSDS SCPS protocol in network layer(SCPS-NP) and Transport Protocol(SCPS-TP) were introduced,characteristics and applicability were analyzed.It was also compared with TCP/IP protocol for contrast,finally design the program verification system to verify the proposal.The results show that for space communications in specific circumstances,the use of SCPS protocol is superior to that of TCP/IP protocol.