The performance system of civil service is one of the important issues of personnel administration. Their suitable performance or not effects the whole organization's target and the quality of government's policy. Thus, the ability of government's service depends most on many of the civil service. The performance system not only evaluates the suitability of civil service but also sets up a standard line for them. The main goal of the performance system is to reward the superior and to eliminate the inferior. Although the limitation of the superior ratio (A&A+) is 75 %, which is a fixed mend of law, the government officer should also consider the equal of administrative function and developmental function of the performance system. So that it can manifest the fairness and the justice of the performance system of civil service.