本文从我国国情出发,提出了“纵向布点、横向膨胀”的手扶拖拉机系列构思及阶梯开发的产品开发设想,并阐述了系列化设计中对通用化的理解与要求,还分析了手扶拖拉机系列化产品间在功能与结构上的联系与分工。 Based on China’s national conditions, this paper put forward a series of ideas of product development of “walking traversing and horizontal expanding” walking tractor and the concept of product development in ladder development. Also, it expounded the understanding and requirement of generalization in serialized design, and also analyzed the characteristics of walking tractor Series of products in the functional and structural relations and division of labor.