The　displacement　is　an　important　indicator　of　safety　evaluation　for　highway　slope.　The　highest　measurement　accuracy　of　global　positioning　system　(GPS)　achieves　millimeter,　and　the　sampling　frequency　can　reach　20Hz.　The　displacement　can　be　solved　real-time,　and　the　GPS　measuring　receiver　adapts　to　the　complex　and　harsh　working　environment.　The　paper　summarizes　the　current　technology　level　of　GPS　application　in　highway　slope　monitoring　and　introduces　a　low-cost　monitoring　technology　that　one　receiver　assemble　multi-antenna　to　measure　several　points＇　displacement.　Based　on　the　application　of　GPS　technology　using　in　highway　slope　safety　monitoring　system,　this　paper　set　the　FuYin　Highway　as　the　engineering　project　and　demonstrate　how　to　apple　the　GPS　technology　in　displacement　monitoring　and　security　evaluation.　©　(2013)　Trans　Tech　Publications,　Switzerland.