The electric mechanism of α-cypermethrin based microemulsion formed by polyoxyethylene styrenyl phenyl ether and dodecyl benzenesulfonic salt combined with different kinds of antiparticles, and the phase behavior were investigated. The results showed that the different solubility of anionic surfactants and the different binding degrees of the antiparticles had actions on the interfacial property of the microemulsion. K^＋ was propitious to the formation of O/W microemulsion for the small hydrated radius, on the contrary, Na^＋ and Li^＋ were not propitious to such formation for the biggish hydrated radius. Ca^2＋ combined with the anion of the anionic surfactant, to yield lipophilic surfactant, which was not propitious to the formation of O/W microemulsion. It was accorded with the result of decomposition rates.

Key words: antiparticle, microemulsion, binding degree