Multi-mobile robots systems have potential applications. When a group of robots work together ,communication is a main approach that the robots used to cooperate with each other. The survey of the recent researches on multi-mobile robots communication system was given in the paper, mainly about research situations and important research topics, they are communication style, communication language, the topology of communication, the protocol of communication and the research on collaboration based on communication of multi-mobile robots. The future research directions of multi-mobile robots communication system are raised then.