Features of 30-60 day oscillation over the Qinghai-Xizang Plateau and itssurrounding areas are investigated by using the ECMWF objective analysis data during May-September 1980. It is shown that there are two branches of teleconnection wave-trains related to the 30-60 day oscillation over the plateau and its surrounding areas:one is the Qinghai-Xizang Plateau-Irkutsk-Europe-the eastern Atlantic branch andthe other is the Qinghai-Xizang Plateau-Irkutsk-Yakutsk-Kamthatka-Aleutian-branch. The 30-60 day oscillation is found on the north and south sides of the plateauand shows different vertical structures in the upper and lower troposphere. The changeof the wavetrains with time is characterized mainly by westward energy dispersion.