Yes Jining, a prefecture-level city under the jurisdiction of Shandong Province, is a type II big city. It is one of the central cities in Huaihai Economic Zone, a famous historical and cultural city and a waterfront eco-tourism city approved by Shandong Provincial Government. Located in Jinyu Building, Jianshe North Road, rencheng district City, Jining City, it mainly recycles and installs fresh air systems.