Abstract: Based on mean air temperature data in winter of Liaoning from 1961 to 2014 from 53 observational stations, using T-test and M-K test, maximum entropy spectrum and wavelet analysis methods, the variation characteristics of mean air temperature in winter of Liaoning from 1961 to 2013 were analyzed. The results indicated that: mean air temperature in winter of Liaoning was linearly increasing in recent 53 years. The warming trend which coordinated with global warming was very obvious. But people should notice that in recent years, temperature in winter of Liaoning was abnormally low. The mutation of mean air temperature in winter of Liaoning from 1961 to 2013 occurred in 1985 to 1986, after which the air temperature went up evidently. Its cycle periods were 3 to 5 years and 17 years. The variation characteristics of temperature in winter in Liaoning were slightly different between new and old data.