The structure of GYXTC8S optical cable is to connect 250μThe optical fiber is inserted into a loose tube made of high modulus material, and the loose tube is filled with waterproof compound. A layer of double-sided coated steel strip (PSP) is longitudinally wrapped around the loose tube, and a water blocking material is added between the steel strip and the loose tube to ensure the compactness and longitudinal water blocking of the optical cable. It is integrated with the steel wire strand into an 8-shaped polyethylene sheath.