A　soluble　poly　{(3-propionyl)　pyrrole-[2,　5-diyl　(p-nitrobenzylidene)]}　(PPPDNBE)　was　prepared　in　acid　medium　and　the　thermal　stability,　photo-physical　property　and　electrochemical　property　of　PPPDNBE　were　also　studied.　TG　curve　indicates　that　the　initial　decomposition　temperature　of　PPPDNBE　is　187.41°C.　The　optical　conjugated　absorption　peaks　of　PPPDNBE　in　DMSO　solution　and　film　are　located　at　around　476　nm　and　484　nm,　respectively.　PPPDNBE　is　a　sort　of　orange-emitting　polymer　materials　and　the　emission　wavelength　maximum　at　is　observed　at　612　nm.　The　optical　band　gap　and　electrochemical　band　gap　of　PPPDNBE　are　measured　to　be　1.69　eV　and　1.62　eV,　respectively.　Moreover,　PPPDNBE　could　be　used　as　the　cathode　material　of　capacitor　and　the　electric　quantity　enhances　gradually　with　the　increase　of　the　voltage　scanning　rate.