The temperature changes near the wellbore of the high temperature and high pressure well have clear influences on the gas production. In the Tarim Oilfield, the regularity of temperature variation near high temperature and high pressure gas well is a quite difficult problem. In order to ensure the normal gas production for the source wells of west to east gas pipeline, this regularity must be in-depth studied. A mathematical model for calculating the temperature near wellbore of high pressure gas well is established. The theoretical temperature curve near the wellbore is obtained by using the finite element method. The temperature changing rule is given during the open and shut down process of gas well. The temperature distribution near the wellbore is investigated by analyzing the heat flux through the wellbore. Calculation is based on actual data of the producing gas layer and non-producing layer, the wellbore temperature distributions around wellbore are analyzed, respectively. The results show that the changing magnitude of formation temperature in the segment of producing layer is smaller than that in the segment of non-producing formation.