In order to investigate the ignition and combustion characteristics of RP3 kerosene, the chemical reaction mechanism(62 species and 344 steps) of n-decane, as a kind of surrogate fuel of RP3 kerosene, is simplified to obtain a new reduced mechanism (36 species and 62steps) based on sensitivity analysis. The reduced mechanism is then tested in perfectly stirred reactor （PSR）and thepremixed burner by using CHEMKIN 4.1. Furthermore， the simpified mechanism is numerically calculated in the premixed burner，and the results are compared with that of the mechanism of 344 steps and experimental data. The numerical results of the reduced kinetic mechanism show the good agreement with that of the mechanism of 344 steps on the equilibrium temperature, the reactant and major component concentration in PSR, and the reactant and the major component concentration by using the r educed kinetic mechanism in the premixed burner basically agree with that of the mechanism of 344 steps and experimental data. Therefore the reduced mechanism can reflect the combustion characteristics of ndecane well within wide temperature range and improve the computational efficiency at the same time.