The invention belongs to the technical field of transportation planning and design and provides fundamental research support and a specific method for aerodrome traffic junctions and airport planning as well as designed handling capacity confirmation. In order to fulfill the purpose, the technical scheme disclosed by the invention adopts an airport collecting and distributing traffic volume determination method based on a multi-user assignment model. The method comprises the following steps: determining freight volumes of different transportation modes and traffic volumes distributed to different transportation modes according to the different utility value principle, wherein the step of determining freight volumes of different transportation modes comprises the followings: 1.1 a collecting and distributing network system, 1.2 a principle for sorting travelers and selecting paths, 1.3 the assignment model, and 1.4 conversion between the freight volume and the traffic volume. The airport collecting and distributing traffic volume determination method based on the multi-user assignment model is mainly applicable to transportation planning and design.