Abstract: Based on the temperature data from the national meteorological observation station from 1904-2019, the variation law and characteristics of temperature in Yingkou city in recent 116 years were analyzed using the linear trend estimation, 7 years moving average, Mann-Kendall test, Morlet wavelet analysis, and other methods.The results show that the annual mean temperature in Yingkou city illustrates a clear increasing trend, with an increasing rate of 0.17℃ per decade.The average temperature of each season also shows an obvious upward trend, with the fastest rising rate in winter, followed by spring and autumn, and the slowest rising rate in summer.The annual mean temperature has obvious interdecadal variation characteristics, which roughly experiences the change process of "cold-warm-cold-warm", and also presents different change processes in each season.There were abrupt changes in annual mean temperature, spring, summer, autumn, and winter mean temperature in 1987, 1988, 2015, 1991, and 1979, respectively.The annual mean temperature has periodic oscillation of 6 years, 20 years, 37 years, and 64 years, of which 64 years is the main period.The seasonal mean temperature also has periodic oscillation of different time scales in Yingkou city.