Based on meteorological observation data of temperature and precipitation in Yanshi City from 1961 to 2010,annual and interdecadal variations of annual average temperature,annual average maximum temperature,annual average minimum temperature,and annual average precipitation in Yanshi City in recent 50 years were analyzed,and then M-K test of changing trend of annual average temperature was conducted. The results showed that from 1961 to 2010,annual average temperature,annual average maximum temperature and annual average minimum temperature showed a significantly increasing trend in Yanshi City,rising by 0. 30,0. 20 and 0. 50 ℃ /10 a respectively. Annual average temperature was the lowest in the 1970 s and the highest in 2000- 2010. There was a sudden change in annual average temperature in 1995. In the 50 years,annual average precipitation in Yanshi City increased by 1. 8 mm /10 a,but the increase was not significant. The minimum of annual average precipitation511. 3 mm appeared in the 1960 s,while the maximum 553. 2 mm appeared in 2000- 2010.
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