Abstract: In order to improve the success rate of fault handling in distribution network feeder automation, an analysis was conducted on the existing problems of fault handling in feeder automation. Following the requirements of power supply reliability, combined with the basic conditions of distribution network structure and terminal automation, in-depth research was conducted on the reliability of feeder automation. Combined with the three stages of the full chain management mode, multi-dimensional protection technologies were proposed to optimize the functions of feeder automation. Based on the positioning results of feeder automation, this paper conducts an in-depth analysis of the existing problems in feeder automation from three dimensions: "pre event, during event, and post event", as well as six protection directions: "terminal information verification, model data verification, FA basic verification, FA topology verification, interface result display, and feeder automation detailed report". A multi-dimensional protection technology for distribution network feeder automation is proposed, and comprehensive evaluation indicators are proposed on this basis. In order to verify the effectiveness of multi-dimensional protection technology and comprehensive evaluation indicators, horizontal and vertical comparative tests were conducted on the test line. The experimental results show that the introduction of multi-dimensional protection technology not only provides a more accurate direction for feeder line rectification, but also improves the success rate and reliability of distribution network feeder automation. Moreover, comprehensive evaluation indicators can serve as predictive values for FA success rate.