Nitrous oxide is an important greenhouse gas,which has a long lifetime of about 120 years and has a 310 times greenhouse effect than CO₂. Since the industrial revolution, the atmospheric N₂O concentration has increased significantly by 20%. Ocean is a net source, about 1/3 of total oceanic souce. Southern Ocean is an important part of the global ocean system, has a unique hydrological characteristics. So far it is regarded as a significant natural source to the global N₂O flux according to the model studies. However,the field work is very limit, due to the fierce in situ conditions. The importance of N₂O reseaches of Southern Ocean, progresses of nitrous oxide researches, especially new technologies applied to underway N₂O measurements in the Southern Ocean are reviewed. The advance of field, model studies and their problems or uncertainties that need to be resolved are also discussed. The using of stable isotope methods will provide powerful tools for marine N₂O mechanism. Development of highprecision monitoring technology is generally the driving force of future research. Developing techniques of laser spectroscopy in marine N₂O studies and measurment of N₂O in sea ice will provide powerful tools to differeciate the N₂O source sink characteristic, constrain their budget and formation mechanism in region such as Southern Ocean.