In order to identify the observation efficiency and evolution process of the wake vortex produced by ARJ21 in the near-ground stage, appropriate experiments were performed at shuangliu airport, and a rapid identification method for wake vortex was presented based on radial velocity observed by CDL. As a result, wake vortex evolution processes of ARJ21 in the near-ground stage were analyzed accordingly. Results show that the wake vortex of the ARJ21 is generated near the ground and then diffuses downwards and outwards, and the circulation of wake vortex gradually decreases with time. However, under the influence of a specific near-ground effect, the secondary vortex will induces the main vortex to rebound, with the height of the vortex core rising from 13 m to 18 m. Meanwhile, crosswind conditions will accelerate the dissipation of ARJ21 wake vortex and push it out the runway. The duration of wake vortex is reduced from 70 s in calm wind to 42 s in crosswind.