Abstract: It is important to study the regeneration of nitrogen in the soil irrigated by reclaimed water, which can maximize the use of recycled water and reduce water pollution. In this paper, through literature survey and test, we find that the nitrogen content in the soil increases with the regeneration of the nitrogen content in water and irrigation amount in reclaimed water increasing, the concentration of ammonium nitrogen in the soil decreases as the depth increasing, while nitrate and total nitrogen increase and then decreasing, and reach the maximum at 70 cm layer.