Abstract: The paper introduced system structure of an intrinsically safe computer used in mine rescue and design of its subsystem as well as its design technology of intrinsically safe circuit in details.From the view of safety ergonomics,the paper expounded humanized design of its apparent structure and its reliability design.The actual application result showed the video images and voice signals photographed and inputted by the computer in rescue of mine accidents are clear and continuous,and it has functions of detection,storage,display and playback,which can be used to establish expert decision system in condition of mature technology.