Abstract:The Tibetan Plateau vortex (TPV) is the main precipitation system on the Tibetan Plateau (TP). It often causes heavy rain, torrential rain or even heavy rainstorms in the lower reaches of the TP. After TPV moves off the TP, its moving path is mainly divided into east moving (E-TPV), northeast moving (NE-TPV) and so on. Based on the database of TPV from 1979 to 2018, this paper selects the NE-TPV in early summer (June) as the research object. According to its moving-off position, NE-TPV is divided into the westward vortex (denoted as NEI-TPV) and the eastward vortex (denoted as NEⅡ-TPV). In terms of the source, structure, circulation and influence on precipitation, the two types of NE-TPV are statistically analyzed and compared with the E-TPV. The results show that the source of the NE-TPV is more northerly than the E-TPV. NEⅠ-TPV is mainly generated in the northwestern part of the TP and NEⅡ-TPV is mainly generated in three relatively concentrated areas. After moving off the TP, the maximum ascending region of NEⅠ-TPV is located on the northeast side of the vortex, while the NEⅡ-TPV is similar to the E-TPV with its ascending area mainly located on the southeast side of the vortex. The moving direction and position of the TPV before it moves off are mainly affected by the westerly fluctuations at 200 hPa, and the moving direction after it moves off is mainly affected by the troughs and ridges at 500 hPa in the east of the TP. Among these troughs and ridges, the Hetao high pressure ridge is particularly important in blocking the NE-TPV. The moving speed of the TPV is jointly affected by the altitude difference and its moving direction. The TPV moving eastward often has a faster moving speed. After the NEⅠ-TPV moves off the TP, it mainly affects the Hexi Corridor Area, and the precipitation is dominated by light rain. NEⅡ-TPV mainly affects the eastern part of the northwestern China and nearly 70% of it will cause heavy rain or torrential rain.