[Objective] Studying the spatial and temporal variations of autumn rain in Panxi region(Panzhihua City and Liangshan Prefecture) during 1961-2017, to provide bases for autumn rain prediction and preparedness against consequent disaster.[Methods] Based on the daily precipitation data from 18 meteorology stations in Panxi region during 1961-2017 and the multi taper method-singular value decomposition(MTM-SVD), the spatial and temporal variations of the autumn rain were analyzed.[Results] ① The first mode of EOF expansion in the autumn rain was accordant all over the area and the contribution rate of variance was 46.1%, which is the main mode of the autumn rain. The sliding t test showed that the main mode of the autumn rain had a significant sharp change around 1995. ② MTM-SVD analysis showed that the autumn rain had a significant 3.2 year period in 1961-2017. The slip window analysis showed that before 1995, the quasi 3 year cycle of the autumn rain was very obvious, and the latter period suddenly disappeared, which turned into a significant quasi 2 year cycle. ③ The 3.4 year cycle of autumn rain in 1961-1994 reached a level of 99% confidence, and the 3 year cycle reached a level of 95% confidence. The typical cycle reconstruction of the quasi 3 year showed that before 1995, the autumn rain was mainly characterized by the inter-annual change of "more-less-less". ④ The 2 year cycle of autumn rain in 1995-2017 years reached a level of 99% confidence. The typical cycle reconstruction of the quasi 2 year showed that after 1995, the autumn rain main manifested an abnormal evolution of the alternation of strong and weak.[Conclusion] The autumn rain in Panxi region had an abrupt climate change before and after 1995. It was mainly quasi 3 year periodic oscillation before 1995, and then was replaced by quasi 2 year cycle.