Abstract: Gas-liquid two phase flow widely exists in deep-water oil and gas production process. As the structural limitation of subsea wellhead, only the wellhead temperature of tubing fluid and annular fluid can be measured. In this paper, considering the heat transfer mechanism of gas-liquid two phase flow in the production process,the temperature distribution model of deep-water wellbore two phase flow is established by semi-steady state method based on the mass, momentum and energy conservation equations. The results show that the temperature of the tubing fluid and the annular fluid decreases with decreasing of the depth for the well, and the outer annulus temperature changes, and the wellhead temperature of the tubing decreases with increasing of the apparent velocity of the gas in the tube and increases with increasing of the apparent velocity of the liquid. The lower ratio of the gas and liquid velocity, the higher wellhead temperature of the tubing fluid, and the higher ratio of the gas and liquid velocity, the lower the wellhead temperature of the tubing fluid. Annular temperature decreases with the increasing the velocity ratio of gas and liquid.