The data in the recent 100 years in Qingdao observatory,which can represent the situations in coastal regions in North China,is used to analyze the interdecadal variability in temperature in four seasons. The relations between the temperature and the PDO index,the averaged atmospheric circulations and the sea surface temperature(SST)are investigated.Based on the analysis,the trend in temperature in the future is projected under the conditions of global warming using CMIP5.It is found that in the recent 100 years,the temperature in coastal area of North China rises with maximum in winter and minimum in summer.The rising is closely related with the SST in the marginal seas and in the northwestern Pacific.The interdecadal variability in temperature is consistent with the PDO cycle.The averaged circulations are dramatically opposite in the positive and negative phases of the PDO cycle and the temperature in Qingdao.Under the conditions of global warming,the temperature probably further rises.