The invention relates to a data processing system, which comprises a plurality of servers and a client connected to the servers through a network. The servers comprise database servers and an application server. Each database server is used for storing a train seat library and a basic information library, wherein the train seat library is used for storing detail information of the tickets and the basic information library is used for storing information related with the train and stations. Under the supervision and control of a server, the database server compresses a seat extractor to count the seat outline information of the train every 15mins by using a window sliding strategy so as to finish the data pre-processing process. The application server is used for data processing and displaying a generation data list. A human-computer interaction interface transmits a request to a view constructor, a view constructor acquires information from the data list, and displays the train information in various density table formats. According to the distributed data processing system, real-time, high-speed and reliable data communication service and flexible display mode of the traveler train density lists can be provided.