The Hengduan mountain area is acting as the essential ecological barrier for the upper reaches of the Yangtze River, which exerts profound influences to the climate and ecological environment of its surrounding areas as well as the Middle West part of our country. As the core of carbon budget climate changes, NPP functions as the crucial indicator in measuring the health status and sustainable development of the ecological system. Therefore, based on the NPP statistics of MODIS C6, vegetation map (1:1000000), meteorological data as well as topographic data, this paper is intended to utilize trend line analytical method and other related analysis methods to perform study on the spatial pattern, variation rules and the driving factors to NPP in Hengduan mountain area during year 2004-2014. Detailed research results indicate that: ①total NPP for Hengduan mountain area during 2004-2014 falls between 183.768-223.239 TgC with average of annual NPP total value as 208.498 TgC and annual NPP mean value per unit area as 463 gC m^-2 a^-1. On the whole, overall NPP is showing an increasing trend with distinct local disparity. ②average annual NPP change rate is within -53-97 gC m^-2 a^-1. And regions with a rising NPP tendency are mainly distributed at the north part, east of middle part as well as east and west of the south part; whereas regions with a decreasing tendency mainly concentrates on Wenchuan-Yingxiu areas which belong to the northwest and middle part. ③The regions with NPP changes resulted from climate factors take up 8.42% of the total coverage of the Hengduan mountain area. These regions mainly sit at the mountainous areas at Daxue Mountain-Shaluli Mountain. By contrast, those subject to non-climate factors occupy 91.58% of the Hengduan mountain area. And they are mainly located at Aba areas in the north and broad regions in the south part with lower altitude. As far as the significance of this paper is concerned, it will provide instructions to the ecological environment construction and the sustainable growth for Hengduan mountain area.