Even though nitrous oxide loess is negligible for the nitrogen losses, it has significant impact for the whole eco-agriculture system. Cause the limited development of in site method for measuring N2O, it is still a hot and tough area for nitrogen research. Since more and more attention had been put on the environment nowadays, there are a lot of work had been done such as in-site measuring methods, emission amount and influential factors in the whole world. However, there isn't any work had been on loess s...