Abstract: This paper analyzed the rime characteristics of Tianshan Tianchi by using the rime weather phenomenon data of Tianchi meteorological station during 1981-2018.The relationships between rime and meteorological elements were analyzed by using the data of hourly temperature,temperature dew point difference,relative humidity,wind and other data when the rime weather phenomenon occurred during 2004-2018.The result showed that the annual average days of rime in Tianshan Tianchi was27.8 d,with the most in winter and the second in spring.November to March of the following year was the most frequent period of rime,and March was the most;rime started at night and ended at 12:00-17:00.Over the past 38 years,the annual rime days showed a fluctuating decreasing trend with a rate of9.8 d/10 a,and the decreasing rate in winter was 4.4 d/10 a.The most favorable meteorological conditions for the occurrence of rime in Tianshan Tianchi was that the temperature was between-4 and-10 ℃,the temperature dew point difference was ≤2.0 ℃,the relative humidity was ＞90%,and the wind speed was≤3.0 m/s.Selecting the meteorological factors that had a greater impact on the formation of rime such as temperature,temperature dew point difference,relative humidity,two-minute average wind speed,fog,etc,established rime meteorological class index of Tianshan Tianchi and tested it in typical years.The index could be used as a reference for tourism meteorological service.