The　Al(NO3)3·9H2O　aqueous　solution　was　used　to　dissolve　chitosan　and　the　chitosan　films　were　prepared　by　solution　casting.　Glycerol　was　added　to　plasticize　chitosan　film.　The　optical,　crystalline　and　mechanical　properties　of　chitosan　films　were　tested　by　X-ray　diffraction,　UV-Vis　spectrum　and　tensile　testing　respectively.　The　results　show　that　chitosan　could　be　dissolved　in　the　Al(NO3)3·9H2O　aqueous　solution,　but　the　higher　amount　of　Al(NO3)3·9H2O　would　lead　to　loss　of　film　forming　ability　of　chitosan.　The　appropriate　amount　of　Al(NO3)3·9H2O　for　chitosan　is　75%　(mass　fraction).　The　addition　of　glycerol　could　increase　the　transmittance　of　Al(NO3)3·9H2O　doped　chitosan　film.　However,　the　transmittance　of　Al(NO3)3·9H2O　doped　chitosan　film　would　decrease　with　the　increasing　amount　of　glycerol.　The　XRD　results　show　that　the　addition　of　glycerol　would　increase　the　crystallinity　of　Al(NO3)3·9H2O　doped　chitosan　film.　The　tensile　testing　results　show　that　the　glycerol　would　increase　the　elongation　at　break　of　chitosan　film　and　decrease　the　tensile　strength.　©,　2015,　Chengdu　University　of　Science　and　Technology.　All　right　reserved.