Abstract: In this paper, the project and the basic demand of mining multimedia ISDN were presented at the first time. The structure model and the key technology of this system were researched deeply, and its theory and funciton were discussed. At the same time, the following four parts were designed: intrinsically safe and intellectualized network substation for mine, flameproof and intrinsically safe network exchanger for mine, intrinsically safe network video server for mine, intrinsically safe IP telephone for mine.