The　quantum　dot　color　filter　membrane　structure　was　simulated.　The　conversion　efficiency　of　quantum　dot　film　to　backlight　and　the　influence　of　external　structure　on　light　intensity　and　color　gamut　were　researched.　Two　different　band-pass　distributed　Bragg　reflector　structures　were　proposed　on　top　and　bottom　of　quantum　dot　film.　Firstly,　the　parameters　of　red/green　quantum　dots　were　imported　through　the　optical　simulation　software,　the　conversion　model　of　quantum　dot　color　filter　was　constructed,　and　the　layer　properties　of　distributed　Bragg　reflectors　and　conventional　filters　were　set.　The　quantum　dot　color　filter　was　excited　by　the　blue　backlight,　the　conversion　efficiency　of　blue　light　to　different　film　thicknesses　and　quantum　dot　specific　gravity　was　studied.　The　optical　influence　of　traditional　filter　and　distributed　Bragg　reflector　on　the　optical　properties　of　quantum　dot　color　filter　was　compared.　The　simulation　results　show　that　the　distributed　red-green　sub-pixel　brightness　is　increased　to　2.19　and　2.26　times,　by　the　CIE1931　standard,　the　color　gamut　can　reach　NTSC128%.　©　2012　Editorial　Office　of　Chinese　Journal　of　Liquid　Crystals　and　Displays.