There is a lot of coal underground in Xuzhou. In the last century, national construction needed resources, and coal was the first to bear the brunt. There are many coal mines around Xuzhou to serve the national construction, and a large number of mining reserves are also decreasing. With the adjustment of national policies, environmental protection is becoming more and more important for the recovery of mine land. Xuzhou was transformed in time and put forward the slogan of "one city, green hills and half lakes", which was particularly successful in mine resumption. For example, Jiuli Lake Wetland and Pan 'an Lake Wetland Park are very popular. In the past, coal was used to