The development of electricity-related industries increased the quantity demanded of long-distance cable. But due to the environmental complexity of long-distance cable’s pavement and the arduousness of detection and maintenance, so it is valuable to make research on long-distance cable’s waterproof structure devise, and introduce the waterproof performance of long-distance cable, in order to analyze the principle and structure designing of waterproof cable, and deepen the detailed research on long-distance cable communication.