Based on the process of guided optical fiber winding and wire packet post processing, the causes of different winding defects are analyzed, and the corresponding evaluation methods and solutions are put forward. The failure mode of guided optical fiber paying off is established. The failure mechanism of optical fiber breakage is analyzed. The winding process is improved. A large number of ground simulated paying off tests have been carried out. The test results show that the winding quality has been greatly improved, and the failure rate of the optical fiber breakage has been reduced by more than 20%.