Communication method and system based on PCIe (peripheral component interconnect express) data exchange

The invention discloses communication method and system based on PCIe (peripheral component interconnect express) data exchange. The method includes the steps of firstly, starting a PCIe switch and subjecting a processor and a PCIe terminal communicated with the PCI3 switch to PCIe equipment search and configuration; secondly, allowing the processor or PCIe terminal to transmit a PCIe read-write request to a port of the PCIe switch according to routing information, allowing the port to structure the PCIe read-write request into a data packet by means of packet format compatible with standard PCIe link layer protocol and extensible routing compatible with standard PCIe routing, and transmitting the data packet to a corresponding port; and thirdly, allowing the corresponding port to restore the data packet into the PCIe read-write request and transmit the request to the processor or PCIe terminal. Multi-processor communication based on PCIe link is achieved by the extended PCIe protocol, and any topological extensible interconnection networks are established.