The　condensed　polynuclear　aromatic　(COPNA)　resin　was　synthesized　using　1-naphthol　as　monomer　and　1,　4-benzenedimethanol　as　crossing-linking　agent　in　the　presence　of　p-toluene　sulfonic　acid,　and　then　allylated　to　prepare　the　allylic　COPNA　resin　having　the　copolymerization　reactivity　with　4,　4-bismaleimidodiphenyl　methane　(BMI)　to　obtain　high　performance　resin.　Properties　and　preparation　of　the　copolymer　resin　of　allylic　COPNA　resin　and　BMI　were　studied　in　this　paper.　The　chemical　structures　and　rheological　properties　of　the　prepolymer　were　characterized　by　FT-IR　and　viscometer,　respectively.　The　curing　reaction　of　the　prepolymer　was　studied　by　DSC.　Moreover,　TG-DTG　was　employed　to　study　the　thermal　behavior　of　the　copolymer　resin.　The　results　show　that　the　prepolymer　has　good　rheological　properties　and　can　be　easily　controlled　during　the　curing　reaction.　Furthermore,　the　cured　copolymer　resin　has　good　thermo-stability,　as　indicated　by　that　its　initial　decomposition　temperature　arrives　at　450C　and　the　carbon　yield　reaches　53.6%　at　800C　in　nitrogen.