A delegation from the Chinese Association for Science and Technology (CAST) visited the City University of Hong Kong on 23 June 2021. The delegation included Mr. Zhe Guo, Director of Research and Publicity Department of CCSU, Mr. Yurong Song, Deputy Director of Research and Publicity Department of CCSU, and Mr. Kai Xu, Deputy Director of Textbook Department of Liaison Office of the Central Government in the Hong Kong Special Administrative Region. Dr. Xuan Luo, Associate Vice Chancellor (Mainland China Affairs) of CityU, firstly introduced the big picture of CityU and its global ranking. Then CSU introduced its work and future development. Professor Kenneth Leung, Director of SKLMP, introduced the SKLMP during the exchange. We had an in-depth discussion and communication, and enhanced mutual understanding.