The thermal field in polysilicon directional solidification furnace was analyzed by using COMSOL Multiphysics simulation software.The side wall of the crucible was tilted at a certain angle and a liner block was added to the gap between the crucible and graphite baffle.The effects of the oblique angles of the sidewall of the crucible at 0°

2°

3°

4°and 5°on the solid-liquid interface at different stages during the directional solidification of polysilicon were analyzed.The results reveal that when the crucible inclination angle is 4°

the heat flux at the side wall and bottom of the crucible is lower than that of ones at 0

and the solid-liquid interface is relatively straight and the curvature value is the smaller at the middle and late stage

which is helpful to prevent the inclination of the grain and ensure the quality of the silicon ingot.