(Due to the long construction time of the existing intranet system of the second core of the xx nuclear power plant, the network equipment can be expected to be gradually aging, and the network products of existing equipment manufacturers cannot be replaced on the market. In case of equipment failure, the network will be paralyzed. Therefore, it is necessary to transform the existing network. Based on years of experience in system integration, on the basis of a detailed analysis of the current situation and needs of the internal LAN of the second core of Daya Bay Nuclear Power Station, a comparative analysis of the current network solutions of well-known international and domestic manufacturers is presented, and a detailed and comprehensive solution is proposed.)