The present invention discloses a method of updating a dual redundant chassis management system, and the method is applied in a server. If the server obtains a change message, it creates a virtual channel between an active chassis management system and a standby chassis management system, so that the active chassis management system can be updated according to the change message, and the change message can be sent to the standby chassis management system through the virtual channel. After the active chassis management system and the standby chassis management system are updated, the virtual channel is closed to provide sufficiency transmission bandwidth and stability for data transmissions, when the server synchronously updates the active chassis management system and the standby chassis management system.