Taking the bulk lorry as the research target,starting from the aspect of engine performance,the paper analyzes the slope angle and slope length limit of bulk lorry on urban expressway,calculates maximum slope angle and slope length according to vehicle’s motion equation, comparatively analyzes current urban expressway design program,and finally puts forward slope angle and slope length referring indicators.%以载重汽车为研究对象，从发动机性能的角度分析了载重汽车在城市快速路中爬坡时的坡度及坡长限制问题，并根据汽车的运动学方程计算得出了最大坡度与坡长，以该数据为基础，对现行城市快速路设计规程进行了对比分析，同时提出了坡度、坡长参考值指标。
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