Space-ground information network integration could efficiently share and utilize the space and terrestrial network resources. There are several space-ground integration information network architectures from different fields to investigate the theory and technique therein. CCSDS has developed advance mature systems and space communication protocol standards. Based on analyzing the CCSDS protocol architectures and application developments at home and abroad, we survey the problems and key principles of TCP/IP application in satellite links. Then, we survey the simulation, research and design progress of satellite-ground integration protocol IPoC (IP over CCSDS). Through the literature analysis of CCSDS protocols and IPoC protocols, this treatise is dedicated to support both system and protocol designs of space-ground information network integration.