By established the mathematical model in heat pipe heat exchanger (HPHE) system, numerical simulation method is used for temperature field, flow field distribution in heat exchanger simulated calculation. The establishment of a single heat pipe inner temperature field model is used as numerical simulation, focus on transition part and inside and outside of each row of heat pipe temperature distribution for moderate-temperature HPHE. Through single heat pipe heat transfer model to analyze the heat pipe heat transfer characteristics in the heat exchanger. The research provides a theoretical basis for the safety of each row of heat pipe heat cohesion in different regions inside the tube. (C) 2015 Elsevier Ltd. All rights reserved.