Abstract: Solubilization of phenol in micellar solution of nonionic surfactant and in coacervate phase of cloud point extraction were investigated with spectrometer method. The result showed that solubilization of phenol in coacervate phase was related to the structure of surfactant micelle. If the surfactant in coacervate phase forms a normal micelle, solubilization of phenol in coacervate phase is the same as that in surfactant solution. If the surfactant in coacervate phase forms a reverse micelle, the concentration relationship of phenol in coacervate phase and in aqueous phase can be regarded as the solute partition in these two kinds of solvent. When the water content in coacervate phase decreases to a constant value, the partition coefficient of phenol approaches a constant.