Most of traditional navigation power equipment uses the plate fin heat exchanger, lead to actual air side heat transfer coefficient is low, heat transfer performance is not ideal. Although traditional shutter fin can overcome the above disadvantages, the pressure drop is higher than the plate fin. In this paper, an improved S-type shutter fin is presented, which has a higher disturbing flow and diversion effect, thus increasing heat exchange and reducing pressure drop. In this work, numerical modeling is carried out for plate fins, traditional plate louver fins and S-type shutter fin, and the relationship between velocity field, temperature field, pressure field, heat transfer coefficient, fitting heat transfer factor and resistance coefficient and Reynolds number is simulated and analyzed. The simulation results show that S-type shutter fin has the best comprehensive heat transfer performance under the same working condition.