中文摘要：

推广了Baek等人最近提出的一个双向行人流模型,提出了两种改进策略,并从行人平均速度-密度关系、行人空间分布密度和位置分布等方面进行了数值分析.研究发现,引入的两个新策略不仅可以提高行人流的平均速度,而且可以提高道路系统（尤其是道路中央区域）利用率,减轻拥堵状况,有效避免严重堵塞的发生.改进的策略对行人的心理特点和行为特性等方面考虑更加全面,而且可以较好地模拟高密度的双向行人流.

英文摘要：

In this paper,we extend a cellular-automata model recently proposed by Baek et al.to simulate traffic dynamics of the bi-direction pedestrians.And we present two improved strategies for the moving rules of the pedestrians.Numerical studies of average velocity-density diagram,spatial density distribution and position distribution of the pedestrians are given.We find that the two improved strategies can not only increase the average velocity of pedestrian flow,but also improve the utilization of the road,especially for the central region,reduce the degree of congestion,and avoid the occurrence of serious congestion.The two improved strategies have more comprehensive considerations of psychological and behavioral characteristics of pedestrians,which are also proper to simulate bi-directional pedestrian dynamics under a high traffic density.