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Climatic warming is promoting change of a very diverse nature in the biological events of an array of insect species, including alterations in phenology. Based on collected historical data, the potential impacts of climate warming on the phenology of Bactrocera dorsalis (Hendel) (Diptera Tephritidae) in Fujian and Guangxi, China were investigated by analysing the four phenological parameters including the date of first occurrence, end occurrence, population initial growth and population peak. Results showed that, during a period of last three decades (1990-2020), the annual and seasonal mean temperatures of Guangxi and Fujian have shown increasing trends at different levels. During these studied periods, the end occurrence date and population peak of B. dorsalis in Fujian significantly advanced, and first occurrence of B. dorsalis in Guangxi also significantly moved earlier. Pearson correlation analysis suggested that the mean temperature in winter and spring were the key temperature variables affecting the occurrence and population growth of B. dorsalis in Fujian and Guangxi, respectively. This research provides valuable implications for understanding the effects of climate warming on insect pests and theoretical guidance for prediction and control of fruit fly pests in the future. [ABSTRACT FROM AUTHOR]