Functional carbon sequestration of eco-system is one of key ways to carbon neutralization. This paper, from perspective of land use, uses carbon sequestration rating to estimate the 2000 and 2020 carbon sequestration and values of Shaanxi’s county-level forest, grasslands and wetlands ecosystems, and applies spatial statistics to reveal its temporal-spatial evolution. During 2000 to 2020, their carbon sequestration has increased at different levels, of which forest increased the most as the biggest contributor to Shaanxi’s eco-system. Carbon sequestration of Shaanxi’s county-level forests and grasslands is of outstandingly spatial clustering, carbon sequestration hotspots of forests are concentrating in Qinling mountainous area, that of grasslands in northern Shaanxi’s Great Wall Windy & Sandy Area, cold spots are all concentrating in Guanzhong plain. Southern Shaanxi’s Qinba mountainous area has the most capability in carbon sequestration, while northern Shaanxi’s loess hilly valley has the biggest increment. All cities have increased their carbon sequestration except Xi’an, Yan’an and Yulin are the top two in growth. The top 5 cities in carbon sequestration values in Shaanxi’s eco-system are Hanzhong, Yan’an, Ankang, Baoji and Shangluo, amounting to 78.33% of the entire province.

Lancang-Mekong cooperation is to materialize China's neighbors coalition with a topic of “drinking-one-river, fate-in-tie”, is also a mechanism in establishing Lancang-Mekong nation coalition, with environmental issues being the crucial point. This paper, combined with concept of coalition and based on Hall's 3D structural theory, summarizes three categories of environmental interest coalitions, partner, ally and united modes, establishes an evaluation index system to evaluate Lancang-Mekong environmental interest coalition modes by means of network hierarchy analysis, and select one appropriate mode that six nations along Lancang-Mekong river develop their river economy under others' supervision to prevent impacts on Lancang-Mekong river ecological environment, which can effectively overcome the dilemma of economy and environment of the related nations.