In order to improve public participation in urban spatial planning and properly deal with spatial conflicts among all kinds of actors participating in urban spatial planning

an interactive urban spatial planning model based on multi-agent systems and a social system（multi-agent systems）.Agents participating in urban spatial planning can exchange knowledge and information with each other frequently

and f inally achieve a consistent decision to form an acceptable urban planning scheme through feedbacks and coordinations.The model is further applied to simulate site selection of construction project in Yuelu District of Changsha City and results show that this model not only better simulates the interaction among various agents under different scenarios

but also provides solutions to spatial conflict in the process of multi-actor urban planning.