Abstract：Research purposes: Heavy haul transportation is an important approach of easing Chinese railway transportation capacity tension and making railway further satisfy the demands of national economic development． Meanwhile，it is also the developing trend of Chinese railway freight transportation． With the large number of dedicated passenger lines put into operation，the transportation capacity in the existing lines will be released to some extent． Transforming the exiting lines in a planned way and running heavy haul trains can take full advantage of the existing equipment，save capital investment， increase the railway carrying capacity substantially， improve the railway productivity and reduce freight transportation costs．
Research conclusions: The paper elaborates the development and planning of Chinese heavy haul railway network， presents the principals ought to be followed when planning the heavy haul corridors． Take the railway maximum income as the object function and take the line carrying capacity as well as the investment limit as the constrains，an investment decision － making for heavy haul transformation and cargo flow distribution model based on path selection as well as the solution method are proposed． The model makes the decision of rail heavy haul transformation more reliable．
宁 超. 既有铁路重载化改造通道规划模型研究[J]. 铁道工程学报, 2011, 28(12): 1-3.
NING Chao. Research on the Planning Model of Heavy Haul Transformation of Existing Railway. 铁道工程学报, 2011, 28(12): 1-3.
Su Yong． Discussion on Modes of Heavy Haul Transport Organization and Railway Track Improvement ［J］． Journal of Railway Engineering Society，2006( 7) : 21 － 23．
2011, Vol. 28 
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