Abstract: In the conversion of methane and propane under high temperature and pressure, the ignition delay time is a key parameter to consider for the inherent safer design of process. In this manuscript, the ignition delay time characteristics of methane and propane (700k~1000K, 10 and 20bar) were studied by means of experiments and kinetic modeling tools in the stoichiometric ratio of fuel to oxygen. All the experimental data are designed by isentropic compression and adiabatic core to meet the reliable experimental data which can be used to generate and verify the detailed chemical kinetic model. The ignition delay time of methane and propane was recorded by rapid compression machine (RCM) and compared to the predicted data obtained by NUIGMech 3.0 mechanism. To test the applicability of NUIGMech 3.0 mechanism under different reaction conditions, the influence of temperature over the range of 700K to 1000K (and the influence of pressure over the range of 10bar to 20bar) on ignition delay time was studied. The results show that NUIGMech 3.0 mechanism can reasonably reproduce the ignition delay time of the experiment under a wide range of conditions studied. The constant volume model of chemical kinetic mechanism was used to reveal the effect of temperature on the elementary reaction, and the negative temperature coefficient (NTC) behavior of propane was also found at the pressure of 20 bar. The experimental data can provide a reference for the correction and application of kinetic data, and also provide a theoretical basis for the safe conversion of low-carbon hydrocarbon chemicals.