Homogeneous　combustion/decomposition　of　fuel　with　peroxide　additives　added　was　investigated　based　on　mass　spectrographic　detector.　The　experimental　results　show　that　fuel　ignition　is　effectively　improved　by　peroxide　additives.　The　available　temperature　range　for　fuel　additive　to　improve　the　ignition　is　500-900　K.　The　laboratory　results　well　agree　with　the　engine　test,　which　indicates　that　this　approach　is　simple　and　reliable　for　screening　HCCI　additives,　providing　a　rapid　and　highly　effective　tool　for　the　future　research　in　this　field.