The communication network of Fengfeng Group Company is a point-to-point PDH transmission,  has the disadvantages of poor stability of the device, short service life, and no supporting ring etc. Because China mobile, China Telecom and China Unicom etc. have been constructed backbone optical transmission network based on SDH (Synchronous digital system), which has the advantages of good compatibility, strong function and strong protection, so Fengfeng Group is constructing the communication optical fiber ring network. The principle of the construction of communication optical fiber ring network and its advantages and disadvantages were introduced. After the communication network is completed in Fengfeng Group, it will be more reasonable structure, clear hierarchy, stable and reliable transmission quality, so as to lay a solid foundation for the safe and stable operation of the company's communications network.