With the rapid development and increase in population in Hong Kong, the number of patrons using Hong Kong's Light Rail Transit (LRT) System has rapidly increased in these few years. The LRT stations, which have been constructed for over 20 years, are small sized platforms serving a limited number of passengers. It becomes crowded most of the time during the day. Upgrading and extension, which includes the integration with the metro lines, has been carried out from time to time. To facilitate the design and the alteration work for a station, the crowding and passenger movement pattern should be studied. A passenger movement model has been established for studying the passenger movement pattern. This article presents an agent-based passenger movement model which has been adopted to examine the dynamic passenger density in a station. Simulation outputs of the model for a LRT station are illustrated.