The rapid development of 5G technology is driving the upgrade and transformation of the network,of which the 5G bear-er network,as an important part of the 5G network,needs to have high speed,high efficiency,flexibility and other characteristics.In or-der to meet these requirements,FlexE technology has become one of the hot topics in the current 5G bearer network.This paper dis-cusses the application of FlexE technology in 5G networks,while considering the problems of limited transmission bandwidth and net-work management difficulties arising in cloud computing,5G communication and data center applications,analyzes using FlexE tech-nology standards and principles,combines 5G network slicing technology and virtual simulation platform,and verifies the feasibility of using FlexE technology on SPN equipment for network design.