As China is located at the easternmost tip of the Eurasian continent, it is greatly influenced by the monsoon climate. The distribution law of annual precipitation in China is that it gradually decreases from the southeast coast to the northwest inland. Generally speaking, the northern part of China is very dry, with little precipitation, which gradually decreases from east to west and is distributed in a belt shape in the warp direction. From the east to the west of China, the precipitation decreases gradually. The annual precipitation in the easternmost part can reach 600 mm, while the annual precipitation in the western part of Tarim Basin is less than 50 mm. Therefore, the precipitation in the north of China is also very different. In the north of China, there are two precipitation dividing lines, namely 200mm isorainfall line and 400mm isorainfall line (the dividing line between semi-arid area and arid area): Yinshan. The 400mm isoprecipitation line basically runs from the west side of Daxinganling-Zhangjiakou-Lanzhou-Lhasa-East Himalaya. It is the dividing line between monsoon area and non-monsoon area in China, and its geographical position is very important. The 800mm isoprecipitation line-Qinling-Huaihe line is the dividing line between temperate monsoon and subtropical monsoon, and it is also the dividing line between north and south. The south of it is a humid area and the north is a semi-humid area. The boundary between semi-arid area and arid area The boundary between monsoon area and non-monsoon area The boundary between humid area and semi-humid area As for its utilization, the utilization capacity of precipitation in China is still very poor, and the lack of water resources has become a worldwide problem. When the traditional way of water resources development can no longer increase the water source, rainwater recycling has become an economical and practical way of water resources development. As a non-traditional resource, the utilization of rainwater has multiple functions: saving water and alleviating water crisis; Increase groundwater through infiltration and improve the ecological environment; Reduce and slow down rainwater discharge and alleviate urban rain and flood disasters. The utilization of building rainwater is to collect, intercept, store, treat and reuse the sky rainwater in the water cycle through natural terrain or artificial methods for daily water use in buildings and communities. This is mainly aimed at cities. For the vast rural areas in China, the use of rainwater is mainly for life. In recent years, farmland irrigation has increased. However, the collection and storage of rainwater is the biggest factor affecting the comprehensive utilization of rainwater in rural areas of China. Due to the backwardness of rural areas and the backwardness of infrastructure, the ability to collect rainwater is poor and it is difficult to store rainwater. Personally, I think this requires strong financial support from the state and financial support for rural areas. But also to increase scientific research and comprehensive utilization of rainwater. Only in this way can we fundamentally solve the problems of water shortage and water use in rural areas of China.

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