The 2020 China Dark Matter Experiment (CDEX) Collaboration Meeting was held in Beijing from December 21 to 22, 2020. More than 50 members of CDEX Collaboration from Tsinghua University, Beijing Normal University, Peking University, Sichuan University, the Institute of High Energy Physics Chinese Academy of Sciences, Yalong River Hydropower Development Co., Ltd. and other institutions attended the meeting. Some participated in the meeting online. Participants conducted vigorous discussions on dark matter theory, physics analysis, HPGe crystal growth, HPGe detector development, low background and low noise electronics, low background measurement, and development of radon mitigation system. The work plan for 2021 was also discussed and formed.