In order to study the evolution process of wingtip vortex under landing condition and provide an initial reference for the study of wingtip vortex at far-field, a simulate model of airplane on landing condition was built and a structured grid was used to generate the airplane grid. The evolution process of wingtip vortex on the airfoil and in near-wing flow field was obtained by solving incompressible N-S equation and transition modified SST k-omega turbulence model.The results show that two co-rotating fused vortices and secondary wake vortex are formed on the wing surface and act together to a stable tip vortices at 0.5L on the near-wing flow field. Meanwhile, the development of wingtip vortex at the whole evolution process is not only affected by environmental factors, but also accompanied by a large energy conversion.