Abstract: Combined Fenton/Photo-Fenton and biological processes are the most promising methods for the remediation of contaminated water and soil. A review is made on enhancing biodegradability by using Fenton/Photo-Fenton oxidation as pretreatment. It is indicated that finding an appropriate oxidation state through varying oxidation conditions is the key to the problem. The applications of the combined processes, mainly on laboratory scale, with some pilot-scale studies, are presented. Finally, the research directions are indicated based on the problems of the combined processes.