Abstract: Annual mean temperature and precipitation data from nine meteorological stations in the Nujiang Basin of Tibet over the period 1980 to 2008 were used to compute the climatic potential grassland productivity using Miami models, and to analyse grassland spatial distribution and variation. Over the past 29 years, climatic potential grassland productivity of the upper reaches (from Amdo to Tengchen) of the Nujiang Basin were mainly affected by the temperature conditions and the mid-lower reaches (from Lhorong to Zayul) by precipitation. From the upper to lower reaches there were generally uneven geographical distributions that changed markedly with age. Correlation analysis demonstrated that climatic potential productivity was significantly negatively correlated with annual mean precipitation (P＜0.01), and with the mean temperature of the main growing season (P＜0.05). There were some regional differences in distribution of climatic potential grassland productivity which was significantly higher in the downstream region than in the upper reaches, The climate will trend to a “warmer and wetter-type” due to temperature rise and precipitation increases, so the climatic potential grassland productivity may be increased in the Nujiang Basin over the next 90 years. The research indicates that the the warmer, wetter trend in the Nujiang Basin will benefit the development of pasture husbandry, especially for improving the eco-environment.