Based on the population projections for Taiwan (2016~2060) of National Development Council, the proportion of working age population in Taiwan will fall drastically and will be rapid population ageing. Police organization will face the same situation in the era of ageing population. The purpose of this study is to explore the relationship between aging, retirement policy and police force age structure. To help meet these daunting challenges, police organization needs to create solutions driven by strategic thinking. Especially the focus on development and utilization of the middle-age police officers to maintain public order and safety work.