The ASOSAI (Asian Organization of Supreme Audit Institutions) WGEA (Working Group on Environmental Auditing) was set up at the 8th Assembly of ASOSAI in Chiengmai, Thailand in October 2000 as the regional organization of INTOSAI WGEA. At the first meeting of the ASOSAI WGEA, the Chinese SAI was elected chair and Auditor General of CNAO, was elected chairman. After the ASOSAI WGEA was set up, what CNAO has done to organize Asian countries to develop environmental audit research, to strengthen the relations with INTOSAI WGEA and to take part in international activities is effective.