Abstract: In order to apply laying conditions of communication lines in old line pole area, and ensure safety of the whole line. overhead micro-beam optical cables with rated breaking force was developed by means of structural design, theoretical calculation, material selection and test verification. Mechanical properties such as tensile and breaking, environmental performance tests were verified. Results showed that overhead micro-beam optical cables with rated breaking force could meet laying conditions of old line rods, and had breaking capacity of rated breaking force in the range of 1 350 to 2 000 N, which could effectively avoid the risk of pole collapse due to fiber optic cable implication when old poles encounter external forces such as vehicle roof hanging, so as to protect the entire line facilities from being damaged.