Abstract: To study the thermal efficiency of hot dry rock production wells producing fluid, according to the structural characteristics of the well depth of a Beijing production wells, the wellbore heat transfer calculation model was established, which verified the geothermal well detection data by using computational fluid dynamics(CFD) software. And on the basis of above research, the analysis of the factors was proposed which affect production well fluid temperature field. Results show that the temperature of the water produced at the bottom of the production well three open section is highest of all, and the heat storage capacity of the water is very big, which makes the outlet temperature of the wellhead increases from 333.1K to 342.3K; under the same engineering parameters, when the depth increases to 400m, it makes the wellhead outlet temperature increase to 337.6K, and the deeper the depth is, the higher the outlet temperature of the liquid producing will be; as improve produced fluid production rate,the shorter production time and heat loss, the larger outlet temperature of liquid producing; under the same condition pump pipe depth, outlet temperature of the liquid producing for heat preservation material pump pipe is 2K higher than convention pump pipe material,which improve the production efficiency.