In order to strengthen the environmental protection cooperation between Taiwan and Japan, this project assisted in organizing the 9th Taiwan-Japan Environmental Conference. In addition to topics proposed by the Environmental Protection Administration of Taiwan (EPAT), we also formulated topic issues by surveying the current key issues propagated by the two nations. The finalized agenda of this conference included the following four issues: Environmental Education, Climate Change Policies, Cross-boundary Air Quality Control, and Expedient Environmental Impact Assessment Process for Wind Turbine. During this event, Japan not only agreed to continue the exchange of the above-mentioned topics, but also committed to further its involvement in the Asia-Pacific Environmental Education Center. It was also preliminarily announced that the 10th Taiwan-Japan Environmental Conference would take place in the first half of 2022. Lastly, after reviewing both Taiwan and Japan’s past bilateral and multilateral environmental collaboration experiences, this project proposed a probable phased collaboration plan for the further development of the environmental exchange between Taiwan and Japan.