Pulse radiolysis experiments were conducted on the probe molecule, pyrene, in acetonitrile, acetone, cyclohexane, ethanol and mixed solutions containing ammonium ionic liquid with different volume. The formation of pyrene radical anion (Py,·-,) was observed at 490nm and the rate constants of the Py,·-, formation were determined in the ethanol solution and in the mixture solution with different ionic liquid volume fractions, respectively. Moreover, the rate constants,are changed greatly with increasing of the ILs concentration in the mixture solutions. The results can be assumed that the dry electrons produce in very short time scales after electron pulse and the solvated electrons can react with pyrene to generate its radical anion in nanosecond time scale.