Served as a member of Expert Review Team (ERT) of UNFCCC, to take part in Greenhouse Gases Inventory review works, include centralized review, in-country review and desk review since 2004. Served as a member of ERT of UNFCCC, to take part in the in-country reviews of sixth national communications (NC6) and first biennial reports (BR1) of United State of America in Washington D. C. in 2014.