Abstract: The difficulty in the automation transformation of distribution network is the determination of the secondary access point of the running distribution network equipment. In this paper, a technology for the secondary transformation of distribution network automation is proposed, that is, the relay is used to connect to the existing components to realize the remote control and remote signaling automation transformation of the distribution network equipment. Reduce the frequent measurement and verification work in order to find a secondary access point in the original transformation, so as to simplify the automation transformation of the distribution network and improve work efficiency.