Abstract: Based on the data of 50 meteorological stations in Jilin Province during 1961-2015, the variations of extreme temperature indices were analyzed. The result showed that warm days, warm nights, frost days, warm spell duration days, daily temperature range, annual maximum value of daily maximum and minimum increased from west to east in Jilin Province. Summer days, warm nights and cold duration spell days decreased from west to east, while ice days increased from south to north. Cold days, cold nights, frost days, cold spell duration days and daily temperature range were found to decrease significantly by 0.75 d·10 a^-1, 2.34 d·10 a^-1, 3.15 d·10 a^-1, 1.67 d·10 a^-1 and 0.23 ℃·10 a^-1 respectively; warm days, warm nights, summer days, hot nights, annual maximum value of daily minimum, annual minimum value of daily maximum, warm spell duration days and growing season length showed statistically significant increasing trends at rates of 0.76 d·10 a^-1, 1.55 d·10 a^-1, 2.34 d·10 a^-1, 1.62 d·10 a^-1, 0.16 ℃·10 a^-1, 0.57 ℃·10 a^-1, 0.80 d·10 a^-1 and 3.22 d·10 a^-1 respectively. It was found that the most extreme temperature indices had an abrupt change in the 1980s, the cold indices decreased and warm indices increased after the change. The main period of the most extreme temperature indices was 3 years. When the longitude increased by 1 degree, the cold spell duration days, summer days, and hot nights decreased by 0.2, 5.2 and 2.3 d, respectively. When the latitude increased by 1 degree, the cold spell duration days, ice days, summer days, warm nights, annual maximum value of daily maximum, annual maximum value of daily minimum increased by 0.5 d, 4.2 d, 5.3 d, 2.3 d, 0.7 ℃, 0.5 ℃, respectively. When the altitude increased by 100 m, the cold spell duration days, growing season length, summer days, and hot nights decreased by 0.4, 1.8, 5.8, 2.9 d, respectively.