我国人口多,人均耕地少,节约用地是我国的基本国策。随着我国社会主义建设事业的发展,小城镇(包括农村集镇)的住宅建设亦不断向多层发展。但小城镇向住宅多层发展,在使用功能上产生了新的问题,水卫问题是其中之一。过去居住在平房建筑中,居民卫生问题北方多使用旱厕, China has a large population and little per capita arable land. Saving land is China’s basic national policy. With the development of socialist construction in our country, the housing construction of small towns (including rural market towns) has also continued to develop at multiple levels. However, the development of small towns to residential multi-levels has created new problems in the use of functions. Water and sanitation is one of them. In the past, people lived in bungalow buildings and residents used sanitation toilets in northern China.