Abstract: Temperature control is the key to realize modernized continuous-steelmaking, just like ladle thermal state greatly influence the temperature loss of molten steel in the ladle turnover process, so the ladle thermal state is significant especially in the endpoint of ladle preheating. But the traditional measurement method and numerical simulation can't realize real-time non-contact temperature measuring of ladle lining inside because of the high ladle lining temperature, complex production site layout and short service life of electronic component. To address the problem, using finite difference method to solve the ladle lining temperature field and using Fluent simulate flame temperature field, with the help of established mathematical ladle one-dimensional heat transfer model and adopted inverse heat conduction problem, mathematic inversion method was used to calculate the temperature field of ladle lining inside and implement the visual monitor of ladle thermal state during the preheating procedure by means of computer language, which contained in the real-time monitoring software compiled by c^#, provides a feasible new method to managing ladle and making reasonable preheating rules.