A ring network system using peripheral component interconnect express (PCIe) is disclosed. The ring network system includes N PCIe bridges. Each of the N PCIe bridges is connected to an individual server and includes a first port and a second port. The second port of an ith PCIe bridge of the N PCIe bridges is connected to the first port of an ((i mod N)+1)th PCIe bridge of the N PCIe bridges. Each of the N PCIe bridges includes an address mapping chip. The address mapping chip of each of the N PCIe bridges configurably maps to a system address of each of at least portion of N servers connected by the N PCIe bridges and configurably maps to an address of each of at least portion of the N PCIe bridges for setting up a mapping relationship between the N PCIe bridges.