Introduction Recognizing the importance of close and constructive cooperation in the field of astronomy in the East Asian Region, National Astronomical Observatories, Chinese Academy of Sciences, National Astronomical Observatory of Japan, Korea Astronomy and Space Science Institute and Academia Sinica Institute of Astronomy and Astrophysics agree to continue to collaborate and support the East Asian Core Observatory Association (EACOA). EACOA aims to construct powerful and cutting-edge astronomy in East Asia by promoting and organizing cooperative works of astronomy. To promote East Asian regional astronomy research cooperation, EACOA encourages and supports highly qualified young researchers from all over the world to join and conduct joint research activities