Anti-interference　magnets　sensor　is　used　to　railway　wheel　signal　detection,　it　includes　a　magnetic　field,　a　set　which　have　induction　to　the　magnetic　field　and　the　signal　processing　circuit　which　connect　to　the　induction　parts.　In　order　to　completely　overcome　the　defect　compared　with　ordinary　wheel　sensor　in　anti-interference,　and　not　only　adapt　to　measure　the　high　speed　train,　but　also　adapt　to　measure　the　low　speed　train.　We　designed　a　kind　of　new　wide　response　speed　railway　wheel　sensor　used　giant　magnetic　resistance.　It　satisfies　the　requirements　of　detecting　speed　of　0km/h　to　350　km/h,　and　improves　the　accuracy　of　detecting　kinds　of　parameters　in　train.　So　it　can　ensure　the　safety　of　the　train　traffic[1-2].　©　(2012)　Trans　Tech　Publications,　Switzerland.