Abstract: Based on the routine rainfall data on Tibet plateau and NCEP/NCAR reanalysis data, it is studied by the relationship between the Eastern Tibet plateau rainfall and the southward/northward shift of western pacific subtropical high in summer of 1993/1994. The results show that: the western Pacific subtropical high is abnormally located to more southern latitude and the high ridge is mainly the quai biweekly outhward/northward oscillation in its processes of northward shift from May to August in 1993; but it is abnormally located to more northern latitude and the high ridge is obviously 30—60 day southward/northward oscillation in its processes of northward shift from May to August in 1994. At the same time, it is found that the changes of the Eastern Tibet plateau rainfall active/break have the similarity characteristics of the high ridge southward/northward oscillation.Therefore, the southward/northward shift of the western Pacific subtropical high in summer maybe related to the changes of Eastern Tibet plateau rainfall active/break.