Based on monthly mean OLR data,and wind field at 300hPa,and by applying Singular Value Decomposition (SVD) technique,the relationship between the convective activities over the Pacific and China's winter monsoon was mainly studied. The results show that the instantaneous correlation between monsoon circulation and convective activities over the tropical Pacific is significant. The leading correlation between OLRA (anomalous) over the tropical Pacific and winter monsoon indicated seasonal and regional dependence. China's winter monsoon is obviously not only associated with OLRA over the equational central Pacific in last summer ,but also associated with OLRA over the western tropical Pacific in last fall. The significant areas in China include southern China and some parts of northwest of China.