In the PTN network planning & construction, leaving backup bandwidth for optical fibers is an effective method to improve net-woric sorvivability. It ensures thai parts of the fiber links an disconnected,and the affected businesses still have sufficient capacity for resources re-routing. In this paper,first look through every network dual-link failure state,then disconnect any two links in the network,after that increase link capacities to assure all failed services can be successfully re-routing again; At last propose the dual-link fiber disconnected capacity planning algorithm (DDCPA) and cany out simulation experiments. The results show that the algorithm effectively saves network bandwidth,reduces construction cost and improves fault tolerance,also has a good performance in link planning of transmission network.%在PTN(Packet Transport Network)网络规划建设中,需要对光纤链路留出备份带宽,以保证部分光纤断开时,受影响业务有足够的容量进行路由重组.这也是提高网络生存性的有效方法之一.文中首先遍历网络双链路的失效状态,然后断开网络中任意两条链路,通过逐次增加链路容量来保证失效业务能够重组路由；最后提出二次断纤链路容量规划算法并进行试验仿真.结果表明,该算法在节约网络带宽、降低建造成本以及故障容错方面有着良好性能,能够很好应用于传送网络的链路规划中.
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