The paper sums up the features of the gray model and the regression analysis model, establishes the combination model according to the optimization principle, undertakes the forecasting analysis by combining with the transportation volume in Weifang to achieve better forecas- ting effect, and concludes the combination model can improve the forecasting accuracy.%综合了灰色模型和回归分析模型的特点，根据最优化原理建立了组合模型，并且结合潍坊市的客运量进行预测分析，达到了较好的预测效果，从而得出利用组合模型可以提高预测精度的结论。
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