The relationship between net primary productivity (NPP) of natural potential vegetation in China and its climate control has been studied. First, site water balance indices are calculated by means of climate station document interpolation. NPP field document is strongly correlated with actual evapotranspiration in growth period, annual actual evapotranspiration, annual potential evapotranspiration and water deficiency indices. Then according to the mechanism of NPP accumulation, a WBINPP model is developed basing on a collection of NPP field document all over the country and site water balance indices interaction: NPP = 2.55 GAE.e(-4.20922-1.9665.AI). Comparing with other NPP models, such as Miami, Thornthwaite Memorial and Chikugo, WBINPP model is more rational and strongly fit to field doccment, the correlation coefficient is 0.845. According to WBINPP model, a spatial pattern analysis for NPP in China is conducted by means of a GLS software, EIS, and the result shows NPP is declined from Southeastern China to Northwestern China. NPP of the greatest value is above 22 t.hm(-2).a(-1) in the region located in Hainan and Taiwan Province; while with different values of 12 similar to 16, 8 similar to 12, 4 similar to 8 t.hm(-2).a(-1) in the region of middle and lower reaches of Yangtze River, the Northern China plain and the Northeastern Region in China, respectively. In the Northern steppe zone NPP is about 2 t.hm(-2).a(-1) and in the dry desert zone is lower than 2 t.hm(-2).a(-1).
