『Abstract
　The characteristics of China's energy structure and the distribution of its coal resources make coal transportation a very important component of the energy system; moreover, coal transportation acts as a bottleneck for the Chinese economy. To insure the security of the coal supply, China has begun to build regional strategic coal reserves at some locations, but transportation is still the fundamental way to guaranty supply security. Here, we study China's coal transportation quantitatively with a linear programming method that analyses the direction and volume of China's coal flows with the prerequisite that each province's supply and demand balance is guaranteed. First, we analyse the optimal coal transportation for the status quo coal supply and demand given the bottleneck effects that the Daqin Railway has on China's coal flow; second, we analyse the influence of future shifts in the coal supply zone in the future, finding that China's coal flows will also change, which will pressure China to construct railways and ports; and finally, we analyze the possibility of exploiting Yangtze River capacity for coal transportation. We conclude the paper with suggestions for enhancing China's coal transportation security.

Keywords: Coal transportation; Linear programming; Transportation cost』

1. Introduction - The importance of coal transportation in the management of China's energy supply
2. Coal transportation studies
3. Research approach and methods
　3.1. Model
　3.2. Data
4. The optimal route choice for China's coal transportation
　4.1. Analysis of the coal flow under the status quo condition
　　4.1.1. Coal transportation without constraints
　　4.1.2. Coal transportation with Daqin Railway capacity constraint
　4.2. The influence of the shift in coal supply zones
　4.3. Influence of the Yangtze River
5. Conclusions
Acknowledgements
Appendix A. Table of distances between main national railway stations
Appendix B. Table of distances of Chinese main domestic sea routes
References