A new ionic polyacetylene derivative was synthesized via the quternization polymerization of 2-ethynylpyridine by using 3-(2-bromoethyl)indole. The polymerization of 2-ethynylpyridine by using 3-(2-bromoethyl)indole proceed well to give a high yield (78%) of polymer. The activated acetylenic triple bond of N-(3-ethylindole)-2-ethynylpyridinium bromide, produced by the reaction of 2-ethynylpyridine and 3-(2-bromoethyl)indole was spontaneously participated to linear polymerization without any additional initiator or catalyst. Various instrumental datas for polymer structure indicated that the resulting polymer have conjugated backbone system with the designed substituents. This polymer was soluble in such polar orgainc solvents as DMF, DMAc, DMSO etc. The polymer showed a characteristic absorption peak of 457 nm and edge wavelength value of 600 nm in the visible region. The cyclic voltammograms of polymer exhibited the irreversible electrochemical behaviors between the oxidation and reduction peaks. According to the increased scan rates, redox current amount was increased and main reduction and oxidation peaks were -1.3 V and 1.1 V, respectively.