The ignition delay times of toluene/O₂/N₂ and n-decane/O₂/N₂ were obtained in a reflection type shock tube, via measuring the shock pressure signal and the OH radical emission intensity signal using a measurement system consisting of pressure sensors, photomultiplier tubes and an oscilloscope. The experiment conditions are over the temperature range from 1175 K to 2023 K, pressure at 0.1 MPa and equivalence ratio of 0.5, 1.0 and 2.0. In the experiment, liquid fuel was atomized into fuel aerosol by the supersonic atomizer. Long shock tube dwell time (about 15 ms) was achieved by tailored contact surface operation under such conditions. Results show that the ignition delay times of toluene is longer than that of n-decane at the same ignition pressure and ignition temperature. With the increase in initial reaction temperature, the ignition delay times of toluene and n-decane shorten. The logarithm of ignition delay times is directly proportional to the reciprocal of temperature. The fluorescence intensity of OH radical in ignition process reveals different change rule at different temperature.