Horizontal directional drilling solid phase control through mud is the principle and technical method of controlling solid particles in mud. Solid control technology is used to remove harmful solids from the mud, retain useful solid phase, and meet the requirements of mud properties in the crossing process.Horizontal directional drilling technology is a trenchless technology used for laying pipelines and cables when it is difficult to dig or when the cost of excavation is high. It has obvious advantages when oil and gas pipelines cross obstacles and important areas such as rivers, lakes, traffic arteries and railway hubs.The HDD mud and water separation system produced by xi ‘an KOSUN can separate solids from the mud, so as to realize the recycling of mud. In practice, the company constantly optimizes the system to meet the requirements of various geological environments and various sizes of processing capacity and treatment. Our company not only manufacture separation systems, but also can do related engineering services. Can be tailored to the actual address requirements of customers, meet the use requirements. When selecting the horizontal directional drilling solid control system, the main principles are as follows: 1. Particle type and size to be removed or suppressed; 2. Quality of mud to be maintained; 3. Size of drilling rig capacity, solid phase clearance rate and cycle rate.