Aiming at the anti-eavesdrop security demand and potential safety hazard in Ad hoc, a secure random linear network coding algorithm was proposed. The algorithm has secure source coding and protecting the coding vectors. The information source secure coding method and optimizing the finite region is defined to guarantee that the information is properly protected. Different coding vectors protecting schemes were designed for adapting security path and without. We applied the secure random linear network coding algorithm in Ad Hoc Networks to meet the demand on anti-eavesdrop. The anti-eavesdrop algorithm based on network coding is simulated and analyzed in NS2 platform, the results shown that comparing with the encryption algorithm, the anti-eavesdrop algorithm based on network coding has better performance in end-to-end delay and encryption speed. Aiming at the anti-eavesdrop security demand and potential safety hazard in Ad hoc, a secure random linear network coding algorithm was proposed. The algorithm has secure source coding and protecting the coding vectors. The information source secure coding method and optimizing the finite region is defined to guarantee that the information is properly protected. Different antigens are protected protected genes were designed for adapting security path and without. We applied the secure random linear network coding algorithm in Ad Hoc Networks to meet the demand on anti-eavesdrop. The anti-eavesdrop algorithm based on network coding is simulated and analyzed in NS2 platform, the results shown that comparing with the encryption algorithm, the anti-eavesdrop algorithm based on network coding has better performance in end-to-end delay and encryption speed.