Abstract: The disclosure relates to a hierarchical PCI (peripheral component interconnect) bus architecture, particularly to a hierarchical PCI bus architecture applied to the VOD (video on demand) system in an Ethernet Network. The architecture includes a plurality of PCI banks, at least a SCSI bank, and a plurality of PCI bridges. Each PCI bank connects a logic processor via at least one PCI bridge, also connects the SCSI bank via at least one PCI bridge. The logic processor receives video demand signals from users, and sends a service command block to the SCSI bank, for the SCSI bank to retrieve, according to the service command block and from a data storage bank, the video data demanded by the users, and sends the demanded video data to a memory of a PCI bank, so that the demanded video data is transmitted by the PCI bank from the memory to users via a network.