Based on monthly mean temperature and precipitation during 100 years (1899—1999) in Qingdao，the trend of summer climatic change is investigated. The main results are as follows: summer temperature has obviously increased，the variation of precipitation is not remarkable over the last 100 years，however，there are dry (wet) and cold (warm) period of alternative changes，but，the tend of summer precipitation in the last 5 decades is remarkably decreased. Such consequence is chiefly affected by the decreasing summer monsoon and SST in the Pacific.