A　poly　{(3-propionyl)　pyrrole-[2,　5-diyl　(p-tetradecoxybenzylidene)]}　(PPPDTBE)　that　had　excellent　solubility　and　film　forming　ability　was　synthesized　by　gradual　molecular　design　method　and　its　molecular　structure　and　property　were　also　characterized　and　analyzed.　Thermogravimetric　Analysis　(TGA)　curve　indicates　that　PPPDTBE　is　decomposed　mainly　by　two　steps,　which　correspond　to　the　fracture　of　propionyl　group　and　tetradecoxyphenyl　group,　respectively.　The　optical　absorption　of　PPPDTBE　in　CHCl3　solution　and　film　is　broad　in　the　wavelength　range　of　450　nm~550　nm　and　the　absorption　peaks　are　located　at　around　480　nm　and　486　nm,　respectively.　Moreover,　the　optical　band　gap　and　the　electrochemical　band　gap　are　1.81　eV　and　1.23　eV,　respectively.