Abstract: Nowadays, the energy state has not been introduced completely into the routing evaluation system in most routing algorithm of Ad Hoc networks. In order to solve this problem, the AntNet algorithm in this paper is improved appropriately to memory and evaluates the changes of the energy state in entire path. Data structures, rules of selecting next node and rules of updating data structures are described in detail in this paper. By Simulation study and analysis, the lifetime and throughput of the Ad Hoc networks can be increased by the improved AntNet algorithm by using the route in which the average energy of each node is higher and more stable.