货运周转量是指运输货物的数量（吨）与运输距离（公里）的乘积；其表示方法为吨公里或吨海里。
利用历史数据建立货运周转量拟合模型，分析比较其拟合效果。
Establishing freight turnover actual-fitted model, and analyze its fitting efficiency.
本文的主要工作有：1、现有货运周转量预测方法的搜集和总结。
The main job of this paper is as following:1. Collection & Summary of forecasting methods.
检验结果表明，产业结构的变化与货运量结构变化没有直接的关系，而与货运周转量结构变化有因果关系。
The results shows that the change of industry structure has nothing to do with the structure of freight quantity, but has causal relationship with the structure of freight turnover quantity.
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