In　order　to　improve　the　routing　algorithm　AntNet[2],　a　new　algorithm　GARA　(Genetic　Ant　Routing　Algorithm)　is　proposed　in　this　paper.　A　path　base　is　maintained　in　each　node　for　each　destination.　Each　path　bases　is　evolved　by　genetic　algorithm.　Ants　are　used　to　explore　and　evaluate　new　paths.　Based　on　the　path　base,　GARA　is　capable　of　providing　2　new　source　routing　modes　suitable　for　different　network　traffics.　Simulation　results　show　that　these　new　routing　modes　outperform　hop-by-hop　routing　modes　(like　AntNet)　in　terms　of　throughput　and　delay,　and　converge　more　rapidly.