当其路线宜定为复曲线而受到客观条件限制又不能按一般复曲线方法定线时,可采用特殊复曲线设计。本文导出了反映特殊复曲线性质及演变规律的嘉临公式,并能用于一般复曲线的各种设计形式中,同时提供了其定线与敷设的简要步骤。 When the route should be determined as a complex curve subject to objective conditions and can not be general complex curve method alignment, special complex curve design can be used. In this paper, we derive the Jia-Lin formula that reflects the properties and evolution of special complex curves, and can be used in various design forms of complex complex curves. At the same time, it provides a brief step of alignment and laying.