The Mud Recycling System, self-developed, mainly used to recycle the slurry essence piling constructions of circulation & counter flush drilling and shied in constructions of slurry balanced, can decrease the slurry discharge, cut tool-sticking accidents, and improve the drilling efficiency. Double screen mesh was adopted in filter system to improve working efficiency by 50% compared with the traditional single mesh one. Meanwhile, our desander has the properties of simple operation, easy maintenance as well as outstanding cleaning and purifying ability, long service life and high reliability.