Synthesis　of　an　acridinium　salt,　9-[2＇,6＇-dimethyl-4＇-(succinimidoxycarbonyl)phenoxycarbonyl]-10-methylacridinium　monomethyl　sulfate,　was　investigated.　The　synthesis　involved　seven　steps　and　all　of　the　intermediate　compounds　and　the　final　product　were　identified　by　IR,　H-1　NMR,　MS　and　elemental　analysis,　respectively.　Results　of　our　farther　study　show　that　the　synthesized　compound　as　a　chemiluminescent　reagent　owns　more　advantages.