By taking the common trunk highway as the study object ,local and global updating rules were redesigned to obtain the improved ant colony algorithm capacity limitation model based on the traditional ant colony algorithm .Calibrating the impedance function and the calculation parameters ,comparative analysis showed that the rate of convergence increased by 39 .3％ and the search time was shortened by 9 .2％ .The selection of evacuation path of the common trunk highway was solved through the im-proved model .In addition ,the selection process of evacuation path after the transportation emergency was simulated and the visu-al paths was obtained based on the traffic flow of common trunk highway from Hebei province .%以普通干线路网为研究对象,在传统蚁群算法的基础上重新设计信息素更新规则和蚂蚁转移规则,建立基于改进蚁群算法的容量限制疏散模型.标定路阻函数和计算参数值,通过对比模型改进前后的评价指标可得,新模型在算法收敛速度提高39.3％,路径平均用时缩短9.2％,改进模型可以更好地解决普通干线公路疏散路径选择问题.最后基于河北省某普通干线公路流量数据,仿真道路突发事件后的疏散路径选择过程并进行可视化分析.
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