In　order　to　detect　the　DOS　attack　(Denial　of　Service　attack)　when　the　networks　adopt　AODV　route　protocol　of　Ad　Hoc　networks.　Such　technologies　as　an　end-to-end　authentication,　utilization　rate　of　cache　memory,　two-threshold　value,　and　distributed　voting　are　designed　in　this　paper　to　detect　DOS　attacker,　which　is　on　the　basic　of　hierarchical　topology　structure　in　wireless　mesh　networks.　Through　performance　analysis　in　theory　and　simulations　experiment,　the　scheme　would　improve　the　flexibility　and　accuracy　of　DOS　attacks　detection,　and　would　obviously　improve　its　security　in　wireless　mesh　networks.