In the process of crystal growth,as a result of the existence of solute segregation phenomenon, it will cause the grown crystal to distribute unevenly along the axial,so as to restrict the large size,long, high uniformity of crystal growth. Aiming at the problem, we design the automatic growth control system and the crystal bar automatic control system to ensure that the liquid crystal growth constant height remains unchanged and the bar add components and crystal components are the same.Not only overcome the segregation phenomenon in the process of crystal growth,but also laid the reliable foundation for the stability of the crystal growth interface shape.