During crystal growth, the solid-liquid interface shape is related to the state of heat flow nearby. The factors that affect the direction of heat flow in the solid-liquid interface include external temperature field distribution and material thermal conductivity. The commonly used solid-liquid interface control methods are summarized, and the CGSim temperature field simulation software is used to simulate three crystal growth processes using different support structures. At the same time, the solid-liquid interface shapes inside the seed area and the cone area are compared. The results show that the support structure has a greater influence on the control of the solid-liquid interfaces inside the seed area and the cone area. Using a suitable support structure design and appropriate selection of materials, with the adjustment of the external temperature field, the ideal convex solid-liquid interface shape can be obtained.