The largest output is Yingcheng Salt Mine in Hubei, and the top ten are China Salt Industry Corporation (Zhongyan Changjiang Salt Chemical Company, Zhongyan Hongbo Company and Zhongyan Zaoyang Company), Hubei Salt Industry Corporation, Jianghan Oilfield and Hubei Yihua Group Co., Ltd. (Shuanghuan Technology). Among them, Yingcheng salt mine in Hubei has the largest output. So it is the first.