Abstract：There are some debates on the tectonic setting of the northern Helanshan in the Late Triassic-Early Jurassic, but it has important academic and practical significances. Based on the analysis on the tectonic events occurring around the Helanshan Mt. and recent studies, the authors suggest that the tectonic setting of the northern Helanshan Mt. in the Late Triassic-Early Jurassic may be similar to that of the Yinggehai pull apart basin in the Early-Middle Cenozoic. During the Late Triassic-Early Jurassic, the Bayanwulashan Mt. uplifted due to the left lateral strike-slipping of the Bayanwulashan-Langshan fault, which is similar to the Ailaoshan Mt. along the Red river-Ailaoshan shear zone, and this left lateral strike-slipping resulted in the formation of pull apart basin in the northern Helanshan Mt., in this basin thick Upper Triassic Yanchang Formation and Jurassic strata had deposited. Although the northern Helanshan Mt. and the Ordos basin may connect with each other geographically, their depositional mechanisms were different, the relationship between the northern Helanshan basin and the Ordos basin may be same to that between the Yinggehai basin and the South China sea basin. During the Late Jurassic, this pull-apart basin reversed resulting from the eastward compression of the Alxa Block. The reason for the left-lateral strike-slipping of the Bayanwulashan-Langshan ductile shear zone was the relative left-lateral transprssion between the Alxa Block and the Ordos Block in the Late Triassic-Early Jurassic, which resulted from the collision between the Sino-Korean Plate and the Yangtze Plate. This model could explain not only the strong extension of the northern Helanshan Mt. different the main Ordos basin in the Late Triassic-Early Jurassic, but also the reason for the limited distribution of the intraplate tholeiite, furthermore it could also interpret the relationships between the uplifting of the Bayanwulashan Mt. and deposition in the northern Helanshan Mt. and the deformation along the southern Alxa block during the same time, and regionally this model could also explain the left-lateral strike-slipping and related sediments developing in the southern Mongolia in the same time.