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With the proposing of “Network Center Warfare” and “Integrated Electricity Network Warfare”, MANET plays an important role in network communication. The practical application environment of MANET is usually filled with complex electromagnetic spectrum, frequent hostile monitor and hostile interference, which resulting in higher requirements about the performance of anti-jamming and anti-interception. According to the above questions, the multipath redundant transmission algorithm is proposed: source node redundant codes the original data into coding packets, parallelly transports the coding packets by the paths calculated by the multipath routing protocol, and destination node can recover the original data by receiving a certain number of coding packets. Combining the multipath routing protocol with redundant coding, the algorithm proposed has the advantage of anti-jamming, anti-interference and without retransmission. Based on OPNET Modeler platform, the number of the packets between the communication nodes under the scenario of lost packet caused by interference and the packets intercepted by monitor node is tested. The test shows that the multipath redundant transmission algorithm can effectively improve the network performance of anti-jamming and anti-interception.