In　an　open　network　access　environment,　the　trusted　network　clients　do　not　want　to　expose　their　identity.　In　this　paper　a　new　trusted　network　connection　anonymous　authentication　scheme　is　presented,　which　is　based　on　ring　signature.　By　adding　a　ring　administrator,　it　can　be　ensure　the　members　of　the　ring　to　be　the　legitimate　trusted　network　clients.　The　safety　of　the　scheme　is　based　on　the　CDH　assumption　and　strong　one-way　function.　It　is　suitable　for　engineering　because　of　shorter　public　parameter　size.