"Determination of the oxidative potential of organic materials: method development" has been prepared by me. In my work I tried to show how we can develop our technical & experimental work for COD determination. Everybody knows about COD and BOD, and this tow terms are much important for our environment. COD is the oxidative potential of waste water solution, measurement of the total concentration of organic matter so through the study of the developed method the concentration of microorganisms or the organic matters can be easily determined. Pollution level of wastewater can be measured by COD determination. Which method is used to determine the COD is very complex and backdated that's why the development of analytical method is so important. And in my work I just tried to do the work about development.