Abstract: Aiming at Zhaogu Erkuang Coal Preparation Plant’s problem of the lump middlings over-standard ratio in lump coal, through the process comparison, chosed to use the heavy medium shallow tank sorting process to transform.Completed a reasonable process design and equipment selection.In the equipment layout design, the limited space is fully utilized and the optimal design is optimized, which realizes the flexible and organic connection between the new system and the original system.After the completion of the project transformation, the average median ratio of lump coal decreased to about 2.50%, meeting the product quality requirements, and achieved good economic benefits.It provides a good demonstration for other jigging coal preparation plants in the Jiaozuo mining area in terms of reducing the lump middlings content of lump coal.