The computer laboratory of higher vocational college is usually equipped with hard disk protection system，which has two protection modes including hardware protection and software protection．Compared to software protection，the lab using hardware protection old computer is easier to meet with faults， and can not find the hardware，often need to reset the BIOS．This paper expounds using the hard disk protection module of software protection mode used in exiting microcomputer laboratory to change the hard disk protection mode in old computer lab，providing reference for the management and maintenance of vocational college computer laboratory．