[Objective] The dynamic change characteristics of carbon density of arbor forest in Tianshan Mountains were analyzed

in order to provide scientific basis for accurate estimation of forest carbon storage and sustainable development in the future.[Methods] Based on the plots of arbor forest in Tianshan Mountains of Xinjiang area

that were investigated every five years from 2001 to 2016

the variation and related factors of carbon density of arbors in this region were analyzed statistically.[Results] From 2001 to 2016

the carbon density of arbor forests in the Tianshan Mountains of Xinjiang area increased with different degrees:the central part of Tianshan Mountains > the west part of Tianshan Mountains > the east part of Tianshan Mountains

and the carbon density change rate was higher in the central part of Tianshan Mountains than in the east part of Tianshan Mountains than in the west part of Tianshan Mountains. From the perspective of forest age

the carbon density of arbor forests in the central and Eastern Tianshan Mountains showed a trend of first rising and then falling with forest age

and the near mature forests had the highest carbon density. In the Western Tianshan Mountains

the carbon density rate showed an increasing trend with forest age. With terrain changes

the carbon density increased first and decreased afterwards with slope degrees. In the Western and Central Tianshan Mountains

the carbon density was the highest in the steep hill. And in East Tianshan Mountains

the highest carbon density was in gentle slope. With the increase of elevation

the carbon density increased first and decreased afterwards in the western and central parts and decreased in the East Tianshan Mountains. With the change of slope orientation

the carbon density in the south slope was the lowest

and no obvious pattern in others.[Conclusion] Since the implementation of Natural Forest Protection Project

the arbor carbon density increased in Tianshan Mountains

and the forest age has the most significant effect. Therefore

in order to improve the carbon sequestration function of natural forest in Tianshan Mountains and explore the greater carbon potential

we should strengthen the regeneration of young forest

optimize the structure of forest age

and promote the healthy and sustainable development of forest resources.