Based on the monthly mean air temperature data in the past 100 a,this paper statistically studies variation characteristics of air temperature in Qingdao and the effects on the temperature of global warming,atmospheric circulation,ENSO events,economic development and urban heat island.The results show that the variability and trend of air temperature in Qingdao are basic similar to those in North China,but the period of cooling in the early 20th century is 10 years longer.The increasing amplitude of temperature in the past 100 years in Qingdao is higher than the mean amplitude over China or other provinces in northern China,and the increasing amplitude of spring temperature is also higher than other provinces.It is found that wintertime temperature in Qingdao is close related with Siberian high and Arctic Oscillation indices,but not close related with ENSO events.In summertime,temperature in Qingdao is not obviously related with Subtropical high indices except in August.