In view of the pros and cons of the existing "abandoning lines to protect electric poles"devices, a new type of "abandoning lines to protect electric poles" device which taken annular ring as a weak link was designed.The experimental study on the mechanical properties of the annular ring was carried out, and the stress and deformation law of the ring was analyzed in order to optimized the device’s structure parameters. The method to improve the stability of the ring is proposed, which provides support for the popularization and application of the " abandoning lines to protect electric poles