The coupling effect of soil nitrogen content and water content significantly affects the growth and stress resistance of turfgrass. In arid environment, nitrogen application can reduce the influence of water stress on plant growth to a certain extent, and promote plants to form an adaptive mechanism with high water use efficiency and low nitrogen use efficiency. However, in humid soil environment, plants will try their best to improve nitrogen use efficiency and reduce water use efficiency appropriately. Proper nitrogen application can promote plant growth and improve plant tolerance to water stress to some extent.