Desander is an important part of the drilling fluid solid control equipment, mainly used to remove finer solid particles in the drilling fluid screened by the shale shaker. It using the principle of centrifugal sedimentation,the suspended particles can be separated and removed from the liquid after being accelerated by the centrifugal acceleration, so that the solid phase content in the drilling fluid can be effectively controlled, and obtain high-quality drilling fluid with excellent Technological properties with reasonable particle distribution, to meet drilling operations requirements.