In today's domestic scientific research vessel and CTD investigation, shout aloud, and other areas of the application, a long armored coaxial cable is the most commonly used, the characteristic impedance is commonly Ω Ω 50 or 75 years, through the signal carrying way, the center conductor at the same time for underwater equipment power supply and two-way transmission signal; Two or three layers of steel wire armored, or kevlar fiber load-bearing; The braided shield belt with winding instead of woven screen net is adopted to prevent the cable from passing through the pulley due to excessive load of lifting objects, which will cause the shield layer to break due to compression, resulting in the decline of electrical properties such as characteristic impedance and anti-electromagnetic interference.