To study the combustion performance of excitation powders, including PETN, RDX and granulated RDX prepared with different formulations, closed bomb was used to measure burning rates and peak pressures of powders under constant volume condition. Results indicate that under the identical ignition, the combustion velocity of PETN is larger than that of RDX while RDX generates a larger peak pressure than the same amount of PETN can do. The velocity and pressure of granulated RDX initially increase and then decrease with the increased amount of KClO₄. The granulated RDX works best at a KClO₄ mass fraction range from 30% to 40%.