Abstract: In order to solve the problems of large amount of secondary slime and lack capacity of tailings dewatering equipment in Shanxi coal transportation group Lvliang Xiaolong coal preparation plant,utilized KXGZ500 /2000-U quick open diaphragm filter press for dewatering,and introduced the structure, working principle,characteristics and technical parameters of the filter press. With the application of quick open diaphragm filter press,effectively solved the problems of large amount of secondary slime and lack of dewatering capacity,so that producing a good economic benefit and social benefit.