Abstract: In order to study the formation mechanism of sticking breakout in slab and prevent its occurrence,main characteristics such as thickness,crack and oscillation mark of the solidified shell are analyzed.A mathematical model simulating the acting force on primary solidified shell is developed.Based on the measured mold temperature data in slab continuous casting,characteristics of temperature variation in the mold under normal and abnormal conditions are analyzed.Typical characteristics of the shell with sticking breakout problem are summarized,and the factors leading to this type of breakout are discussed,such as the properties of protecting slag,casting speed and oscillation parameter.Temperature variation characteristics of the thermocouple in the sticking process are concluded and the results can provide guidance for the sticking breakout prediction.