In　this　study,　polyamidoamine　(PAMAM)　was　added　to　raw　lacquer　in　different　proportions,　and　the　curing　process　and　properties　of　lacquer　film　were　investigated　by　using　thermogravimetric　analysis　(TGA),　Fourier　transform　infrared　spectroscopy　(FT-IR),　and　scanning　electron　microscopy　(SEM).　To　investigate　the　cross-linking　state　between　PAMAM　and　urushiol,　NMR　was　used　in　this　study.　The　experiments　revealed　that　the　comprehensive　mechanical　properties　of　modified-film,　especially　the　impact　strength,　were　significantly　improved.　In　addition,　the　touch-free　drying　time　of　lacquer　film　decreased,　and　its　alkali　resistance　was　improved　due　to　the　cross-linking　of　PAMAM　and　urushiol　molecules.