This　paper　designs　a　wireless　sensor　network　for　road　traffic　information　acquisition.　Geomagnetic　sensors　of　traffic　state　acquisition　are　also　designed.　The　geomagnetic　sensor　can　be　adaptive　to　the　surrounding　changes　about　magnetic　field　and　magnetic　interference.　Besides,　it　can　possess　traffic　flow,　speed　and　occupancy　detection　simultaneously　and　synchronously.　For　the　research　and　development　of　wireless　sensor,　we　will　focus　on　the　vehicle　recognition　and　reducing　energy　consumption.　©　2014　IEEE.