In electrochemical methods using chemically modified electrodes have been widely used as sensitive and selective analytical methods for the environmental and clinical analysis.One of the important properties of the chemical modified electrodes is their ability to minimize overpotential effect and facilitates of different analytes.Hydroxylamine is known as kind of reducing agent widely used in industry and pharmacy.It is one of t minimize he intermediate products of nitrogen-cycle and plays important role in life science.Also,hydroxylamine is an important intermediate during the oxidation of aminia to nitrite.Unfortunately,hydroxylamine with a large overpotential for oxidation at ordinary electrodes,is not a suitable analyt for electrochemical methods.In the past years,various chemically modified electrodes have been prepared and applied in determination of hydroxylamine.