Loess,　with　high　permeability,　collapsibility,　slaking,　is　uniform　in　grain　and　high　in　porosity　and　low　in　moisture　content.　It　is　very　easy　to　collapse　when　subjecting　to　water　and　loading.　In　China,　loess　distributes　about　640,000　km(2),　almost　covering　most　of　the　northwest　China.　Zonal　highway　stretches　most　loess　terrain　in　western　China.　Due　to　its　special　properties　sensitive　to　water,　geohazards,　such　as　soil　erosion,　slope　instability,　debris　flow　etc　frequently　occur　in　the　loess　area　in　the　condition　of　heavy　rainfall,　which　results　in　tremendous　loss　and　damage　to　road.　Based　on　extensive　field　investigation,　types　and　causes　of　highway　hazards　in　loess　are　presented.　The　most　effective　way　is　to　prevent　water/rainfall　from　infiltration　into　roadbeds　and　embankment　slope.　In　terms　of　road　hazards,　principles　of　application　of　geosynthetics　in　loess　highway　are　suggested.　In　the　paper　geosynthetics　application　in　preventing　roadbeds,　pavement,　embankment　slope　and　drainage　from　damage　and　failure　are　discussed　in　details　with　emphasis　on　special　hazards　in　loess.