Abstract: This article described the application of big data technology in optimization of railway unloading organization such as real-time analysis for railway unloading freight cars dynamic distribution, monitoring and early warning in the process of transportation for railway loaded freight cars, prediction and early warning of arrival time for railway loaded freight cars, aided unloading plan, arranging freight special line, the use of public goods yard, etc. Through the use of big data technology, Kunming Railway Administration has achieved very good economic and social benefits.