Abstract: Based on the daily temperature data from 1970 to 2019 in Gaochun district, Nanjing city, using anomaly analysis, linear correlation analysis, M-K mutation test and other methods, the temperature change characteristics and the mutation of the 24 solar terms were analyzed （Insects awaken, Clear and bright, Grain buds, Grain in ear）. The results showed that the average temperature and the first and last day temperature of the 24 solar terms in Gaochun in recent 50 years showed obvious normal and unimodal characteristics, and the trend was consistent. Great heat and Great cold were the hottest and coldest solar terms of the year respectively. The temperature rises gradually from Great cold to Slight heat, and decreases gradually from Great heat to Slight cold. The temperature anomaly was mostly negative before the 1980s and positive after the 1990s. There was a sudden change in Insects awaken temperature in 1993, the rising trend became significantly larger, and there was a sudden change in warming in Grain buds in 1985. The temperature of each solar term showed a significant upward trend, which was consistent with the background of global warming. Agricultural activities of Gaochun district can be appropriately advanced.

Key words: twenty-four solar terms, air temperature variation, mutation analysis, Gaochun district of Nanjing city