Horizontal　reinforcement　solutions　are　generally　used　in　pavement　engineering　to　prevent　or　delay　the　sudden　damage　of　adjacent　roads　caused　by　collapse　of　cavities　induced　by　vehicle　loads　and　ground　water,　and　to　provide　an　early　warning.　This　kind　of　approach　is　extensively　adopted　in　many　countries,　but　load　transfer　mechanisms　and　characteristics　of　the　interfaces　between　the　geosynthetics　and　soils　are　not　yet　fully　understood.　This　study　presents　an　review　of　the　state　of　the　art　for　the　geosynthetic-reinforced　embankment　overlying　voids.　The　mechanical　mechanisms　(e.g.　sliding　surfaces　of　the　embankment　fills,　arching　theory,　membrane　effect,　soil　expansion　over　the　geosynthetics,　friction　in　anchorage　areas　and　reduction　of　tensions　in　the　transition　areas)　are　mainly　introduced.　The　comparisons　and　shortcomings　of　the　design　methods　are　also　discussed.　To　improve　the　design　methods,　the　several　mechanical　behaviors　of　prior　literatures　need　to　be　further　investigated:　load　transfer　mechanisms,　delayed　deformation　and　collapse　due　to　the　geosythetics,　settlement　calculation,　ultimate　bearing　capacity　and　stability　of　the　embankment　subjected　to　localized　voids.　The　load　distributions　have　not　been　revealed,　the　exiting　design　methods　are　overly　conservative.　A　set　of　recommendations　and　insights　is　presented　for　further　researches.　©　2018,　Science　Press.　All　right　reserved.