The characteristics of wet body for several partial wet irrigation techniques were briefly introduced, as well as the influencing factors and the simulation of soil moisture moving and the environmental effect caused by partial wet irrigation. Then from nitrous oxide emission of agro-soils and its relation to soil moisture variation the non-uniform characteristics of soil moisture were put forward, some should be studied in future, included nitrous oxide emission rule and its responses to soil water distribution under partial wet irrigation, irrigation parameters optimization of partial wet irrigation for high irrigation uniformity and low nitrous oxide emission.