in order to reduce the congestion in AODV protocol and decrease the time taking to find the route, CA-AODV protocol was applied to a routing selection algorithm with cognitive ability of an ant colony algorithm. The algorithm uses probability routing and diffusion of pheromone improving routing search capabilities, around development send congested nodes, to improve the route algorithm performance, enhance the adaptability of the algorithm. By comparing the improved routing algorithm With the original AODV protocol, the simulation results show that, the routing algorithm reduces the end-to-end delay and network congestion.