The micellization of TTAB(tetradecyltrimethylammonium bromide) and the solubilization of 4-halogenated phenol isomers in aqueous solution of that surfactant in water have been studied by the UV-Vis spectrophotometric method. Those properties in aqueous solutions of NaCl and n-butanol have been also measured to determine the interactions between the micelle and 4-halogenated phenols and the solubilized sites of those molecules in the micelle. The results show that the values of ${Delta}G^o_m$ and ${Delta}G^o_s$ are all negative and the trends of those values depend on both the kinds and the concentrations of additives. Namely, by adding NaCl both ${Delta}G^o_m$ and ${Delta}G^o_s$ values are all decreasing, but by adding n-butanol the ${Delta}G^o_m$ value decreases and the ${Delta}G^o_s$ value increases.