Using weather station data to analyze the annual evapotranspiration and influencing factors in Yulin City from 2000 to 2019, and discuss the dominant meteorological factors affecting the changes in evapotranspiration. The results show that from 2000 to 2019, the annual evapotranspiration in Yulin City has an obvious upward trend, with a growth rate of 9.89mm/a; the correlation between evapotranspiration and meteorological factors on a daily scale is as follows: temperature>pressure> wind speed > relative humidity. Generally speaking, temperature is the main meteorological factor affecting the evapotranspiration changes in Yulin City.