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The calculation method of numerical simulation and FLUENT software were combined, to have three dimensions numerical simulation of the heat pipe air pre-heater, the fluid flow and thermal performance of the heat pipe air pre-heater in the furnace surplus heat recovery system were studied.According to the structure and heat transfer characteristic of the heat pipe air pre-heater, the three dimensions physical model of fluid flowing and the heat transfer in heat pipe air pre-heater was established;the non-structural mesh, the k-ε turbulence model, and the coupling heat transfer law were used to study flow field and the temperature field distribution in the heat pipe air pre-heater.The calculation results essentially coincided with the engineering case and provided the theoretical basis for the heat pipe air pre-heaters further theoretic research and spread application.