The seasonal, interannual and interdecadal variations of the intensity of different subtropical upper jet-stream centers at 200 hPa are analyzed by using the NCEP reanalysis data. The results show that the seasonal variations in locations and intensity of different centers are obviously different from each other. The change is characterized by the following: the area and the wind speed of the EAJ center are much more variable; the variation in the area of the WJ center is small ,though its variation of the wind speed is big; the variation in the area of the AJ center is large,though its variation of the wind speed is small. The characteristic parameters which are used to describe the intensity of different centers indicate that they have respectively seasonal variations, though each center is strong in winter and weak in summer. Each season has its own annual trends. Though their interannual and interdecadal periods do not keep the same step with each other, they all have 6-8 years oscillation periods in a sense.