Based on the data of monthly mean temperature from National Climate Center and NCEP/NCAR reanalysis etc, the anomalous climatic change of South China temperature is studied. Accordingly, a further study on high temperature weather in July 2003 is made. Results show that the circulation over Eurasia is remarkable difference between in high and low temperature years. The East Asian summer monsoon over tropical region is weaker(stronger) during high(low) temperature years. The temperature anomaly of South China in July bears close connection with last winter and summer SST in South China Sea, East China Sea and the central and eastern Pacific and typhoon activity in South China Sea and the Northwest Pacific.