Abstract: Under the background of increasingly intensified global warming, to explore and study the temperature variation over the past few decades in Nanchonag can provide a theoretical basis for local economic and social sustainable development. In this paper, through analyzing daily temperature changing data of seven meteorological stations of Nanchong City from 1961-2014, annual and seasonal average temperature in the past 54 years were calculated; meanwhile, power spectrum analysis, Mann-Kendall test and the sliding T mutation test were applied to analyze and discuss cycle temperature change and climate catastrophe point. The results showed that a significantly cyclical change of temperature occurred in the past 54 years; the annual average temperature and the average temperature in the spring and summer of the year had mutations, and the annual average temperature and the average temperature in the spring appeared a mutation from cold to warm, the climate catastrophe point was in 2006, and the mean temperature of autumn and winter had no catastrophe point. An extremely high temperature was observed in the year 2006, which was the second history peak in Nanchong City. 2006 had a number of records that broke through the history of extreme values, this was consistent to the conclusion of the study that the catastrophe point of the annual average temperature in Nanchong in the past 54 years was 2006.