The development based on pda gis not only can input fast and manage the data of expressway disease , but also can realize data visual , make uninteresting data management ocular and convenient , improved the working efficiency of the administrative department of the expressway greatly , bring heavy direct economic benefits for the maintaining administrative department , and can obtain the enormous social economic benefits 基于pda的gis开发应用不仅可以对高速公路病害等数据实行快速的录入、管理，而且可以实现数据的可视化，使枯燥的数据管理变得直观方便，同时大大地提高了高速公路管理部门的工作效率，为养护管理部门带来很大的直接经济效益，而且可以获得巨大的社会经济效益。
3 . the thesis gives three pattens to solve these problems , they are " one bureau in a porvince " , " one company one line " , " all - in - one to expresswayes " . from the qualitative analysis and quantitative analysis to the three pattens , it educes a conclusion that " one company one line " is the best pattern to expressway 3给出了“一省一局” 、 “一路一公司” 、 “一体化”三种高速公路管理模式，并通过定性分析和定量分析( ahp法) ，确定“一路一公司”将是解决高速公路目前所存在问题的最好途径之一。
