With the continuous development of port construction, the overlap of hinterland between ports in similar regions, homogeneous competition and structural overcapacity and other problems have become increasingly apparent. In order to correctly understand the characteristics of the production and operation of various cargo types in the port, further clarify the functional positioning and development direction of the port, and optimize the allocation of resources, this article comprehensively considers the production capacity, operation capacity and development potential of the port"s cargo category, and proposes the port sub-category competition The concept of power and its evaluation index system, and the combined weighting-TOPSIS method is used to evaluate the port sub-category competitiveness. Finally, the evaluation system and method are verified through calculation examples. The results show that: The same port has different competitiveness for each category of cargo, and the competitiveness of each category of cargo is closely related to the port’s production capacity, operational capacity and development potential for that category of cargo.The evaluation result is basically consistent with the actual situation, has the advantages of objective, effective and practical, and can provide a theoretical basis for port resource integration and port group decision-making.