Abstract: This application provides a data processing method, an apparatus, and a system. In an example, a peripheral device interconnect express (PCIe) device establishes a first PCIe link to a host through a first interface and a second PCIe link to the host through a second interface. The host sends first data to the PCIe device through the first PCIe link and sends second data to the PCIe device through the second PCIe link, wherein both the first PCIe link and the second PCIe link are in an active state during data transmission.