Abstract: ；With the low finned tubes used in the condenser as the research object，the two-dimensional model with the refrigerant (R22) flow in tube and the air flow outside tube is established by using the fluid heat transfer analysis module of ANSYS FLOTRAN CFD, and its fluid-structure interaction simulation is analyzed. Orthogonal experiments are performed to study the distribution of the flow field and temperature field for the heat transfer process. The following conclusions are drawn from the analysis with the heat transfer theory and fluerics theory； the heat transfer performance of finned tube is significantly better than that of the light pipe with the same heat flux； the heat transfer performance of finned tube is enhanced with the increase of the fin spacing and fin height and weakened with the increase of fin thickness within the specified range； but the pressure drop outside the tube is significantly weakened with the increase of fin height. The structure parameters of finned tube can be optimized with the overall consideration of the heat transfer performance and pressure drop.