A method and system for maintaining a System Management BIOS (SMBIOS) in a computer system is provided. According to the proposed method and system, the BIOS of the computer system is updated first. The reserved SMBIOS information pre-stored in a memory unit is then stored into the BIOS of the computer system after the BIOS is updated. While the computer system is restarted, the reserved SMBIOS information can be written back into the rebuilt SMBIOS block.