Based on the monthly air temperature,precipitation and evaporation data of six observation stations from 1981 to 2015 in Weihai,the variation characteristics of climate of air temperature,precipitation and evaporation were analyzed in detail.The results showed that the air temperature has been on the rise,and the precipitation has fluctuated,and the evaporation has been decreasing in the past 35 years in Weihai.Takahashi’ s evaporation equation can be used to assess the evaporation estimation.The abnormal meteorology caused by climate change needs to pay enough attention to the prevention of natural disasters.