Abstract: The position and shape of solid-liquid interface in hot mold continuous casting process are the most important factor determining the quality of the casting billet. The composition of hot mold continuous casting equipment and the process characteristics of hot mold single crystal continuous casting were introduced in detail, and the main process parameters affecting the solid-liquid interface were summarized. Two solid-liquid interface shapes of concave and convex in solidification direction were discussed, and the influence of process parameters on solid-liquid interface shape was briefly described. Then,the characteristics of solid-liquid interface affecting the surface quality of continuous casting rod billet, such as rough, hot crack, slub and pull leakage, were analyzed. The effects of mold temperature, continuous casting speed, cooling distance and cooling water volume on the position of solid-liquid interface and the surface quality of continuous casting rod blank during hot mold continuous casting were discussed. Finally, the research and development direction of hot mold continuous casting process was prospected.