1-(p-N-Carbazolylphenyl)-2-phenylacetylene (p-CzDPA) was polymerized by TaCl5-co-catalyst systems (cocatalysts : n-Bu(4)Sn, Et(3)SiH, and 9BBN) to produce acetone-insoluble polymers in about 60-70% yields. Poly(p-CzDPA) was a yellowish-orange solid, most part of which was soluble in toluene, chloroform, etc., and its weight-average molecular weights were around 4 X 10(5). This polymer formed a tough film by solution casting, and was thermally very stable (the onset temperature of weight loss in TGA in air 470 degrees C). The oxygen permeability coefficient of the polymer at 25 degrees C was lower than two barrers. The present polymer showed photoconductivity and redox activity.