Abstract: In order to effectively solve the problem of active and standby computer switch as the host switching operation at the same time in KJF2000N coal mine safety production integrated monitoring system, it adjusted realization scheme of double switch function, to better achieve double switch function of KJF2000N system. Based on Socket communication principle, establishing connection protocol(three times handshake mechanism) and terminating connection protocol(four times handshake mechanism), It formulated KJF2000N double switch handshake protocol, achieved data communication between active and standby computer by Socket connection and listening function at any time, and timely prepared for switch work for the host on the host machine to quit or failure so as to ensure that the system could continuously monitor real-time monitoring on the underground equipment and environment.