GYXTW(metal reinforced, steel core polyethylene sheath, steel wire central bundle filled outdoor communication optical cable) structure is to place the loose tube in the center of the optical cable, and put the single-mode or multi-mode optical fiber into the inner filled waterproof composite loose tube made of high-modulus plastic. The outer side of the cable core is longitudinally wrapped with steel strip. Two parallel steel wires are used for HDPE sheath after reinforcement