文章介绍采用缩小比例的模拟斗齿对小龙潭露天矿的原型煤、泥灰岩等进行垂直层理的直线型切割，通过对参与切割的试样物理、力学参数、切割参数的因次分析，建立无量纲方程，进行相似理论的模型试验和对诸参数组织正交试验，来预测原型斗轮的切割阻力，为设计开发斗轮挖掘机提供理论依据。最后，由整机性能测试来加以验证。 This article describes the use of a reduced proportion of simulated bucket teeth for straight-line cutting of prototype coal, marl, etc. of Xiaolongtan open-pit mine, and through the analysis of the physical, mechanical and cutting parameters of the samples involved in cutting. Set up non-dimensional equations, carry out similarity model test and organize orthogonal test on parameters to predict the cutting resistance of the prototype bucket wheel and provide theoretical basis for designing and developing bucket wheel excavator. Finally, it is verified by the overall performance test.