Abstract: Course and characteristics of sticking leakage of molten steel in mold was introduced and appearance feature of tear position in sticking shell was unveiled in this paper.Expansion pattern of tear lines caused by sticking and characteristics of temperature transmission in the process of sticking were analyzed by geometric method.In order to improve the accuracy of prediction,horizontal and vertical temperature transmitting behavior should be detected simultaneously,and thus the thermocouple should be laid according to the rule of the equivalence of horizontal and vertical temperature transmitting time.In addition,several typical temperature changing patterns were studied and two atypical temperature patterns of sticking leakage were added,which can provide reference and basis for correct dynamic recognition of sticking leakage and surface defects of shells.Thus,a foundation has been laid for the development of advanced leakage prediction system based on temperature measurement with thermocouple.