As　an　organic　binder　for　bonded　Nd-Fe-B　magnets,　epoxy　resin　(EP)　has　poor　heat　resistance　but　good　moisture　resistance,　while　sodium　silicate　(SS)　has　poor　moisture　absorption　but　better　heat　resistance　and　corrosion　resistance.　In　order　to　improve　high　temperature　stability　and　decrease　moisture　absorption　of　bonded　Nd-Fe-B　magnets,　EP/SS　composites　were　applied　as　the　binder　to　prepare　bonded　Nd-Fe-B　magnets.　The　magnetic　properties,　moisture　absorption,　corrosion　resistance,　compressive　strength　and　microstructure　of　composite　bonded　magnets　were　investigated.　The　results　show　that　EP/SS　bonded　magnets　can　obtain　excellent　magnetic　properties　at　room　temperature,　and　even　useable　magnetic　properties　a　thigh　temperature　environments　at　200　degrees　C.　EP/SS　composite　binder　effectively　improves　heat　resistance　and　corrosion　resistance　of　bonded　Nd-Fe-B　magnets,　and　reduces　the　hygroscopic　properties.　The　molecule　of　sodium　silicateis　rigid　and　keeps　it　original　shape　at　high　temperature　environments.　In　addition,　SS　in　composite　binder　improves　the　mobility　of　the　magnetic　powders　during　the　pre-pressing　process,　which　makes　the　magnetic　powders　attain　a　more　regular　structure.　These　two　factors　will　increase　the　mechanical　properties.　Moreover,　sodium　silicate　in　the　composite　binder　can　also　cover　the　surfaces　protecting　the　magnetic　powders　from　oxidation　and　corrosion.　EP　in　composite　binder　can　cover　SS　surface　to　reduce　the　water　absorption　of　SS　as　epoxy　is　a　hydrophobic　material.　The　EDX　analysis　shows　that　the　composite　binder　has　accumulated　in　the　gaps　of　the　magnet　powders,　which　not　only　improves　heat　resistance　and　corrosion　resistance,　but　also　increases　the　mechanical　properties.　Therefore,　EP/SS　composite　binder　endows　bonded　Nd-Fe-B　magnets　excellent　comprehensive　properties.　(C)　2019　Chinese　Society　of　Rare　Earths.　Published　by　Elsevier　B.V.　All　rights　reserved.