In order to ensure the stability of engineering vehicle radiators and weaken the impact produced by air side vortex, the improvement on geometric features of radiator fins was conducted. The simulation results of tubular radiator model were first compared with the experimental data to verify the accuracy of simulation model. Then the radiator model with serrated vortex generator was built and the JF factors before and after improvement were calculated and compared respectively. In the end, the comparison and analysis among the radiators with vortex generator of different structural parameters were performed. The results indicate that the JF factor of the improved radiator is higher than that of the nonimproved radiator at the air velocity range of 2-12 m/s and the difference reaches around 30% at the air velocity of 12 m/s.It is further found that the influence on heat exchange coefficient and pressure loss for the radiator reaches the greatest when the angle of attack is 30° and the height of vortex generator is 2.34 mm. In addition, the width of vortex generator has little effect and the height of saw tooth has great effect on the pressure loss but little effect on the heat exchange coefficient.