Using the daily data of temperature from China Meteorological Administration and the NCEP／NCAR reanalysis as well as the OLR data, we have analyzed the influences of West Pacific subtropical high(WPSH) on the three principal patterns of summertime temperature anomalies in the middle and lower reaches of the Yangtze River on inter-annual timescale. Three indices (IEAWPi) of anomalous circulations have been defined on the basis of circulation anomalies related to the three principal patterns of summertime temperature anomalies. East Asia-West Pacific indices are well correlated with the temperature indices. The indices of anomalous circulations are found to be able to describe variations of WPSH that affect the patterns of summertime temperature anomalies. The anomalous circulation structure in vertical direction in both the high and lower value years identified by East Asia-West Pacific indices (IEAWPi) are equivalent-barotropic in the middle and lower reaches of the Yangtze River. The maintenance of the three patterns of anomalous circulations in association with the three principal patterns of air temperature anomalies are related to the wave train originating from tropical regions. The indices (IEAWPi) as defined in the present paper could be useful for us to forecast and diagnose the temperature anomalies in regions of the Yangtze River valley.