Abstract: In order to monitor the temperature of the steam flooded production wells dynamicly,based on the heat transfer and two-phase flow theory，and energy conservation，taking into consideration the impact of the temperature and pressure on thermophysical parameters，we mphasize the effect on the geothermal gradient changed by the steam driver response layer，deduce out the wellbore temperature distribution of the non-homogeneous differential equation，and a two-dimensional mathematical model of wellbore temperature field is established.The temperature distribution in wellbore can be directly and accurately calculated according to the well-head temperature，output and other production parameters.This provides a theoretical basis for preventing flash vaporization and improving the pump efficiency.Wellbore temperature calculation is consistent with the measured temperature.

Key words: Liaohe Oilfield, heavy oil, steam flooding, response layer, wellbore temperature distribution, flash vaporization, pump efficiency