Based on the daily temperature data of 53 stations in the North China Plain from 1961 to 2014

the characteristics of temperature change of 24 solar terms are analyzed by using the trend feature index

Mann-Kendall mutation test

moving T-test and spatial interpolation. The results show that: ① The temperature of 24 solar terms presents a quasi-normal unimodal distribution

and the highest average temperature in a year occurred during Great Heat (30.4 ℃)

the minimum average temperature occurred during Greater Cold (7.5 ℃). The temperature fluctuated largely during the days around Pure Brightness and Beginning of Winter. The average temperature showed an increasing trend during 24 solar terms

especially during the spring type solar terms. ② The spring type solar terms became warming in 1990s

and the summer and autumn type solar terms were cool in 1980s and 1970s and became warming after 1990s. The winter type solar terms were cool before 1990s

and the temperature increased obviously during 1990s and 2010s. ③ The average temperature of the Waking of Insects showed a significant warming trend

with a warming rate of 0.459 ℃/10a

and a warm mutation occurred in 1998. The average temperature of the Pure Brightness increased

with a warming rate of 0.43 ℃/10a

and the temperature mutation happened in 1998. The average temperature of the Lesser Fullness of Grain showed a weak trend

with a warming rate of 0.12 ℃/10a. There was no obvious mutation in the past 54 years. The annual average temperature of the Grain in Ear is on the rise

with a warming rate of 0.16 ℃/10a

and the mutation happened in 1998. ④ In the past 54 years

the spatial characteristics of the average temperature of the Waking of Insects and Pure Brightness showed that the temperature in the north of the North China Plain was lower than that in the south of the Plain

and the highest temperature and the lowest temperature appear in Xinyang and Zhangbei

respectively. The spatial characteristics of the average temperature of the Lesser Fullness of Grain and Grain in Ear showed that the temperature in the north and east of the North China Plain was lower than that in the middle and south of the plain

and the highest temperature and the lowest temperature appear in Jinan and Taishan

respectively.