This paper analyzed the change in the staff number and its factors among the merger experienced municipalities between FY2002 and FY2009. The factors were decomposed into the national and local, the latter were divided into the population-area factors and others.
As the results this paper showed us that; the staff number in the merger experienced municipalities remains excess compared to the level of the merger non-experienced; the population-area factors put upward pressure on the staff number, while the other local ones put downward pressure on it; the population factors depress the staff number, but the area factors boost it; the population area factors have negative correlation with the population density and positive correlation with the number of the former municipalities when the new one was born; the other local factors are contrastive with the population-area ones.