With the increase in air traffic flow, the refinement and dynamic reduction of wake separation have become a trend in the development of civil aviation, and the study of wake evolution has become a frontier scientific issue in the field of civil aviation. Based on this, the Reynolds Averaged Navier Stokes Equations method was used to study the influence on the evolution of the aircraft wake vortex whether the B737-800 aircraft was equipped with the blended winglets. The change of wake vortex circulation was calculated by using the APA wake vortex dissipation model in the NASA dynamic wake system under different meteorological environment parameters. It was found that the blended winglets can divide the wingtip vortex, and change the flow characteristics of the wingtip effectively. It could also increase the velocity gradient, reduce the wake vortex velocity, wake vortex energy concentration, and wake vortex intensity. The reduction of the wake vortex strength by the winglets is different under different rates of atmospheric turbulence dissipation and atmospheric stratification stability.