Abstract: In order to realize the data sharing among railway freight liquidation system, transportation revenue system and transportation statistics system, this article analyzed the basic contents of shared attribute data and calculation data. The article studied and compared three sharing technologies:shared data table, Web service and shared data file. It chose to share data in the form of shared XML data file, gave a data sharing scheme and formulated a data exchange mechanism. Practical application shows that this method is in line with the current situation of railway freight liquidation system and can meet the data requirements of freight liquidation.