Abstract: Time series of pentad mean 600 hPa height indices of Qinghai-Xizang Plateau region Monsoon features and derived from 1951—2000 NCEP/NCAR reanalysis of daily gridded data (2.5 °×2.5°), with which to investigate basic features and trends of Qinghai-Xizang Plateau high field index (QXPFI) on an interdecadal basis. Results indicate that the 600 hPa level is under the control of a low (high) in summer (winter), with the low tending to appear ahead of time and intensity progressively, on the whole, the annual variation in the indices is similar to that of the number of rainy days in Qinghai-Xizang Plateau. Moreover, correlation of QXPFI to the 160-station precipitation and air temperature in China shows that, on a simultaneous basis, the indices are significantly correlated to the precipitation as "﹣+﹣ " in zonal bands from northern to southern China, and the indices display a positive correlation with winter temperature, which is most significant over eastern edge of Qinghai-Xizang Plateau and South China.