The environmental protection department in the Song Dynasty was called the street department. In ancient China, the Department responsible for environmental sanitation was called Yu. In addition to urban environmental sanitation, it also needed to protect and manage mountains, rivers, forests, Ze and other areas. In the Song Dynasty, the court set up a street department, which was mainly responsible for the work of urban streets. The Street Department of the environmental protection department of the Song Dynasty was established in the third year of Jiayou of Renzong of the Northern Song Dynasty, that is, 1058. It is subordinate to the Dushui prison. According to the official records of the history of the Song Dynasty, "the street department is in charge of the people and soldiers governing the road."
The main responsibilities of the street department are to repair the streets, keep the streets clean, manage the market, do a good job in security work, and mobilize the regular army when necessary.
The establishment of Street department not only played an important role in urban management and environmental protection and health in the Song Dynasty, but also played a reference role in urban construction in future generations. （SongDaiDeHuanBaoBuMen）