Abstract:The largest mass extinction event in geological history occurred during the Permian-Triassic boundary, which may be related to the extreme paleoclimate changes at that time. Previous studies on the paleoclimate mainly focus on the continuous marine strata, however, the studies of terrestrial strata in this period are relatively scarce. In this paper, we selected the Upper Permian Sunjiagou Formation in Yiyang area of western Henan as the research object to recover the paleoclimate by sedimentology, mineralogy and elemental geochemistry. Based on the comparision with other terrestrial strata, the impact of climate change on the extinction of the Permian-Triassic boundary are discussed. The results show that: (1) the Sunjiagou Formation has experienced the evolution process of shore lacustrine-shallow lacustrine-shore lacustrine subfacies in Yiyang area, and the lithofacies changes, absence of paleontological fossils, a great number of calcareous concretions and other sedimentary structures show that the climate of the upper member is hotter and more arid than that of the lower member. (2) The geochemical elements and clay mineral assemblage also indicate that the climate experience a transition from warm and humid to hot, arid and semi-arid. (3) The conclusion of this study is basically consistent with other terrestrial strata in the same period, reflecting the consistency with global paleoclimate transformation. The factors such as abrupt rise in temperature, extreme drought of the climate and destruction of the terrestrial ecosystem at the end of the Permian may be the main reasons that leading or accelerating the extinction of terrestrial life. This study has guiding significance for the relationship between climate change and biological extinction in the Permian-Triassic boundary, which provides new evidence to explore the causes of global biological extinction in this period.