容延迟网络(DTN)大时延、链路频繁中断、拓扑结构瞬息万变的特性,使得其对单次通信的可靠性要求极高。然而,传统上采用的长纠错码可靠性的实现通常以较大的编码冗余为代价。文章采用了性能更为优良的Raptor码来进行信息传输,并针对不同的DTN网络模型,数学分析与推导得到了可靠传输的优化模型,最终通过穷举算法得出了信息可靠传输的条件,弥补了这方面工作的空白。 Delayed network (DTN) Large delay, frequent link breaks, the rapidly changing topology, making it highly reliable single communication requirements. However, the reliability of traditionally used long error correcting codes has often come at the cost of greater coding redundancy. In this paper, Raptor codes with better performance are used for information transmission. According to different DTN network models, the mathematical model and the derivation of the optimal model are established. Finally, the conditions of reliable information transmission are obtained through exhaustive algorithm, The blank of this work.