Abstract: The present disclosure provides a chassis, a chassis monitoring system, and a chassis monitoring method. The chassis includes: at least one PCIe device; a PCIe switch including an upstream bridge port for connecting with a host of an electronic device and at least one downstream bridge port for connecting with the PCIe device; a virtual endpoint, configured in the PCIe switch, for receiving the SES instruction sent by the host, causing the firmware in the PCIe switch to execute the SES instruction, and feeding back an execution result to the host after the firmware in the PCIe switch generates the execution result according to the SES instruction, the host monitors the chassis according to the execution result.