The invention provides methods and system for remotely and automatically deploying a server OS through utilization of a BMC. A method comprises the following steps that a remote controller logs in a to-be-installed server BMC to obtain a TOKEN value; a remote OS mirror server BMC is accessed according to the obtained TOKEN value, a system mirror on a remote OS mirror server is remotely mounted ona to-be-installed server, and a virtual system installation disk CDROM is generated; the remote controller sends a command to set a boot item of next-time reboot of the to-be-installed server as the CDROM; and the remote controller sends the command, so the to-be-installed server is rebooted and enters the CDROM to start installing a system automatically.