The working space affected workers’ security, health, comfort and working efficiency, which was an important research field of the human-machine system. According to the actual working situation of Chinese driller, the computer simulation of working space nearby driller was established. The lower limb joint angle changed in a comfortable range, which determined the area of H point, and then the regulated quantity of the driller’s chair was calculated by the computer. The working space satisfied both the short driller and the tall driller was obtained by the regulated quantity of chair, which would be taken as the restriction to carry on the human-machine interface design of driller console. In this way, the ergonomics factor was considered in the initial stage of design, and the efficiency of design was improved greatly. Finally, the CATIA human body posture analysis module was used to examine this design proposal, which proved that this method was feasible and effective.