Our country is a country with serious water shortage, and the per capita water resources possession is only 1/4 of the world average level. More than half of the cities are short of water, and the situation in northern cities is more serious. At present, the garden industry has become one of the biggest water users in the city. According to statistics from relevant departments, the water allocated to Beijing's gardens every year is equivalent to the water volume of 20 Kunming Lakes. Therefore, water saving is an important aspect of the economical garden greening construction.