Southwest of Yunnan is wealthy in natural resources. With the rapid development of social economy in recent years, artificial-garden, including rubber, tea and eucalyptus were planted on a large scale, which mainly occupied natural forests and arable land. It resulted in changes of land-use structure and space distribution. In order to discuss the effect of land use/cover change on the net primary productivity of vegetation, the paper analyzed temporal variation and spatial distribution of NPP using comprehensive model, CASA model and MODIS products(BIOME-BGC model) of 2000, 2005, 2010 and 2015 in Ximeng County. The results showed that:(1) the NPP of Ximeng County was affected by meteorological change, vegetation types and growth status, and human activities, the values of both BIOME-BGC model and CASA model decreased firstly and then increased, whereas the values of comprehensive model kept increasing during 2000 to 2015;(2) the spatial distribution pattern of vegetation NPP change present as “low-high-low-high-low” type(“M”) from west to east in Ximeng County. It was related to the distribution characteristics of hydro-thermal resources land use/cover change, the spatial distribution change of NPP in Ximeng county was mainly concentrated in artificial-garden planting area;(3) In the three NPP models, the CASA model and the MODIS(BIOME-BGC) model were more suitable for the simulation of NPP in mountainous terrain with complex terrain and climate, and the CASA model was more accurate.

Key words：a region with large-area artificial; NPP; temporal and spatial variation; land use/cover change; CASA model