The frequent volcanic events in the Early Triassic period were the main causes of the global climate and marine environment anomalies. A lot of research on the volcanic events during the important boundary period of the Early Triassic have conducted, but few reports have been made on the other volcanic events stratas beyond the typical boundary. Methods: In this paper, we carried out some researches of the Jialingjiang Formation tuffites in the Puyi area by petrology, petrography, zircon geochronology and trace elements assemblage characteristics in the Southwestern margin of the Upper Yangtze.Results:Most of the tuffite zircons have the internal structures of acid magma zircon, the trace elements are characterized by a strong loss of LREE and strong enrichment of HREE; obvious positive Ce anomaly and negative Eu anomaly, and Th/U ratio> 0.2, which have the characteristics of typical magmatic zircon. The two groups of the zircons concordant ages are 250.6±0.6Ma and 249.1±0.8Ma, which correspond to the Smithian—Spathian (S—S) boundary and the middle Spathian substage in the early Triassic.Conclusions: The parent rocks of the Jialingjiang Formation tuffites are mainly acid granites, followed by neutral syenites and a few basic rocks. The tuffites of Jialingjiang Formation have the homology with Permian—Triassic boundary (PTB) tuffites and Olenekian—Anisian boundary (OAB) mung bean rocks, which formed in the collision orogenic environment of active continental margin. The source area is probably located in the Changshan tectonomagmatic belt—Shiwandashan volcanic belt in the China—Vietnam border area. During the continental crust collision, the crust of the source area was in a continuous thickening stage, and the partial melting of the thickened lower crust formed the upwelling of supplementary magma caused the early crystalline minerals partially melting corrosion. Frequent volcanic events in the Early Triassic period were the main factors leading to climate change and biological rebirth and extinction, the reason may be the result of the comprehensive feedback of factors such as the parasol effect and the greenhouse effect. However, the specific evidence still needs to be constrained by the more comprehensive results of more disciplines in the future.