This　paper　expounds　the　characters　of　geosynthetics　and　analyzes　the　principles　of　reinforcing　embankment,　preventing　reflecting　cracks　and　protecting　slopes　of　embankment　by　usage　of　geosynthetics.　In　addition,　some　geosynthetics　are　applied　to　treat　highway　diseases　such　as　embankment　sinking,　uneven　sinking　between　new　and　old　embankment　and　reflecting　cracks　of　semi-rigid　asphalt　pavement　in　Ningxia　loess　area.　As　a　result,　geosynthetics　material　is　a　kind　of　novel　and　effective　material　to　prevent　road　diseases　in　Ningxia　loess　area.