Abstract: By studying the related factors that affect freight rates and the results of freight clearing, a decision support system for maximizing clearing income of railway freight was established to solve such problems that how to balance freight volume and freight rates, to formulate reasonably freight rate policies and to achieve maximum benefits after the implementation of freight clearing regime. The system was implemented by using database technology, crossplatform.Net framework, and C# language to realize the informatized process of submission and approval of freight negotiation items and operation analysis. The system can estimate the clearing incomes of specific freight plans and make feasible proposals by comparing the estimated incomes. Meanwhile, it can evaluate the phased operation quality of operating units objectively and help raise operation consciousness, providing strong support for the improvement of operation and management level of operating units.