The structure of GCYFY (non-metallic reinforced loose tube twisted polyethylene sheathed communication outdoor optical cable) is that the single-mode or multi-mode optical fiber is sheathed in the waterproof composite loose tube made of high modulus plastic. The center of the optical cable is a non-metallic reinforced core. The loose tube (and filling rope) is wound on the central reinforcing core to form a compact round core. The gap of cable core is filled with water blocking yarn to prevent water accumulation. The aramid yarn is wound on the outside of the cable core to protect the polyethylene outer sheath.