由于无线链路和拓扑结构的时变特性，Ad Hoc网络的优化设计面临挑战．为解决这个难题，提出了跨层设计的方法．叙述了Ad Hoc网络跨层设计的概念，介绍了基于跨层方法的一些路由设计思想．提出了跨层路由设计中存在的问题和研究方向．-Since the wireless link and the topological structure of time-varying characteristics, Ad Hoc network optimization design challenges. To address this problem, put forward a cross-layer design approach. Ad Hoc networks described cross-layer design concept, introduced a method based on a number of cross-layer routing design. Proposed cross-layer routing design problems and research directions.