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针对当前应用的道路清障车主要为卡车载体牵引,占用体积大,不适用于拥堵及狭窄道路汽车清障的现状,在现有电动搬运车结构基础上,设计了一种体积较小、使用方便、操作灵活的小型道路清障车,对其主要结构和液压系统进行了设计,并说明其工作原理。利用MATLAB优化工具箱对道路清障车上的剪式举升装置进行了机构多目标函数的优化设计,运用优化设计的概念优化液压缸的安装位置参数,减小了液压缸的最大输出力,从而减小液压系统能耗,为产品的改进设计提供可靠依据。“,”According to the present situation that the current road wrecker with a large occupied volume is mainly towed by truck and cannot be applied to car clearing on the congested or narrow road,based on the structure of existing electric pallet truck,a small sized road wrecker is designed,which has some advantages such as small volume,convenient to use and flexible operation. The main structure,hydraulic system and working principle are designed and illustrated in this paper. The optimization design of mechanism multi-objective function for scissors lifting device is carried out by using MATLAB optimization toolbox,and installation position parameters of hydrau-lic cylinder is optimized by using optimization design concept,which decreases the maximum output force of hy-draulic cylinder and reduces the energy consumption of hydraulic system,and provides a reliable basis for the im-provement design of this kind of small sized road wrecker.