Promotion plays an important role in the development of both individuals and organizations by discovering talent. However, there has been distrust and conflict regarding the promotion system among members who insist that constables are relatively limited and delayed in being promoted. The purpose of this study is to identify problems with the current police promotion system and suggest policy plans to reduce delayed promotion. The study analyzed official and unofficial statistical results on the relationship between promotion and entering the job. After the study, the result shows that rank and personnel management systems need to be improved, under which new officers are unequally distributed in a lower rank. There need to adopt and activate plural class system released by the Police Bureau of the Ministry of Public Administration & Security and the National Police Agency, and guarantee the total number of high-ranking promotion of constables. Secondly, there also need to expand police stations with superintendent general in order to reduce delayed promotion and provide with effective and stable public security services. Third, it is necessary to reduce the current 11 ranks of police officers like corporals or inspectors to reorganize the rank system similar to that of the government officials, which enables to increase the advancement ratio of high-ranking promotion for senior superintendent or more. Forth, the regulation of police officers’ employment and regulation need to be rectified to expand the promotion opportunity based on length of service and increase the rate of promotion for deputy assistant commissioner or more of constables up to 20%. It is both the Police Bureau of the Ministry of Public Administration & Security and the National Police Agency that should arrange concrete and detailed devices and regulations for constables to be timely and equally promoted for their effort and competent.