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　obtain　ally　COPNA　resin.　The　copolymer　of　the　ally　COPNA　resin　and　bismaleimide　(BMI)　was　prepared,　and　its　mechanical　properties　were　studied　in　this　paper.　The　properties　and　morphologies　of　the　cured　copolymer　were　characterized　by　mechanical　testing　machine　and　scanning　electronic　microscope　(SEM).　The　results　show　that　the　copolymer　exhibits　good　mechanical　properties,　indicated　by　that　tensile　strength,　elongation　at　break,　flexural　strength　and　Vickers　hardness　of　the　copolymer　arrives　at　76.8　MPa,　3.1%,　162.3　MPa　and　27.9　respectively,　when　the　mass　ratio　of　the　ally　COPNA　resin　to　BMI　is　1:1.　Moreover,　the　copolymer　has　fracture　toughness,　showing　some　dimples　and　ductile　deformation　in　fractured　surfaces　of　the　copolymer.