Abstract: Computer assembly and maintenance is an elective course for computer related majors.The course of computer hardware assembly,the BIOS settings,the hardware testing,hardware fault detection,the installation of operating system,and other experiments are developed.The course of computer assembly and maintenance of virtual experiment system is developed.It mainly uses the Virtools software technology and Vrml,and they are involved in the completion of the course of all hardware experiment.By allowing students to practice in the virtual system,not only the beginning ability of students is improved greatly,and the damage to computer hardware and software is reduced,also the maintenance work of the staff of computer room is greatly reduced.It has a good social,economic and management benefit.