The singular value decomposition (SVD) method is applied in this study to investigate the coupled mode between summertime upper-level zonal winds over East Asia and sea surface temperatures (SSTs) in the WesternNorth Pacific. Monthly means of wind fields, geopotential height, and vetical velocity from NCEP/NCAR reanalysis and SSTs from NOAA observations are used in this study. Possible relations between the upper-level jet stream over subtropical East Asia and the Pacific-Japan (PJ) teleconnection are explored. Results indicate that in the years of positive mode for the East Asian subtropical jet (EASJ), the EASJ intensified and shifted southward; the South Asian High in the upper troposphere intensified and extended eastward; the western Pacific subtropical high (WPSH) strengthened and extended westward in the mid-troposphere; SST warming occurred over the Philippine Sea while SST cooling was found in the Kuroshio Extension region; convective activities weakened over the Philippine Sea and the tropical western Pacific but intensified over the Japanese Sea and the Kuroshio Extension region in the mid-latitude. The positive mode years for the EASJ correspond to negative PJ phase. In the years of negative EASJ mode, the EASJ shifted northward and weakened; the South Asian High in the upper troposphere weakened and retreated westward; the WPSH in the mid-troposphere weakened and withdrew eastward; SST cooling was found over the Philippine Sea while SST warming occurred over the Kuroshio Extension region in the mid-latitude; convective activities intensified over the Philippine Sea and the tropical western Pacific but weakened over the Japanese Sea and the Kuroshio Extension region. The negative EASJ mode years correspond to positive PJ phase. Since the summertime upper-level jet stream activities over subtropical East Asia are closely related to the PJ teleconnection, it is possible that the PJ teleconnection behaves as a linkage between the EASJ activities and SST anomalies in the western North Pacific.