A new ionic liquid polymer gel electrolyte containing 1-butyl-3-methylimidazolium iodide, polyvinylpyrrolidone, potassium iodide, and iodine has been prepared and characterized. Controlling the concentration of 1-butyl-3-methylimidazolium iodide, KI, and I2 with 0.9 M, 0.5 M, and 0.12 M, respectively, the ionic liquid polymer gel electrolyte attains the maximum ionic conductivity (at 30 degrees C) of 2.3 mS cm-1. Based on the ionic liquid polymer gel electrolyte, quasi-solid state dye-sensitized solar cell was fabricated and its overall light-to-electricity energy conversion efficiency of 5.41% was achieved under irradiation of AM1.5 (100 mW cm-2). The dye-sensitized solar cell employing the ionic liquid polymer gel electrolyte shows a more stable photovoltaic performance than a dye-sensitized solar cell assembled with liquid electrolyte.