With the development and progress in the field of optical design and processing, the vehicle head up display system has been developed into augmented reality head up display, the virtual image distance is generally about 7.5m, the larger virtual image distance is also accompanied by more product performance problems such as vertigo, but international standards are missing in this area. Based on the principle of binocular parallax, this paper analyzes and studies the problem of vertigo. By building a platform simulating the position of the vehicle, the binocular parallax is objectively measured in the imaging images of AR-HUD, and it is concluded that vertical parallax declination angle of three models is 8.6′, 2.6′ and 5.2′ respectively. At the same time, the subjective verification of vertigo sensation is carried out on the AR-HUD of the three models. Based on the principle of binocular parallax, the glare problem of AR-HUD can be analyzed and detected.