The micellar catalysis on the rate of hydrolysis of 2-methoxy phenyl phosphoramide by hydroxide and hydroperoxide ions in Buffer medium of pH 9.0 has been investigated. A cationic surfactant cetyl trimethyl ammonium bromide (CTABr) catalyse were used in the reaction in presence of hydroxide ions and more strongly in presence of hydroperoxide ions. The reaction is catalysed by CTABr more strongly in presence of hydroperoxide ions than hydroxide ions. Anionic surfactant sodium lauryl sulphate {[CH3(CH2)15] (NalS)} has little effect on the reaction rates probably because ionic micelles strongly inhibit the nucleophilic attack of OH- ions on phosphorus atom of dianions of phenyl phosphoramide. Addition of NaCl, KCl or NaBr inhibits reaction because CI- and Br- displaces OH- ions from the micelle. A systematic approach to investigate the mechanistic changeover of these effects have been accounted quantitatively in terms of pseudo phase ion exchange model. The support of isokinetic relationship, bond fission and reaction path will be suggested for the hydroxyl (OH-) and hyproperoxide (O.OH-) ions on 2- methoxy phenyl phosphoramide.