Start of AIUB/ISSI and ISSI-Beijing Collaboration 25. August 2021: On August 24/25, 2021, the ISSI and ISSI-Beijing International Team led by Prof. Wei Feng from the Institute of Geodesy and Geophysics of the Chinese Academy of Sciences and Prof. Adrian Jäggi from the Astronomical Institute of the University of Bern (AIUB) had its first meeting. The team supported by ISSI and ISSI-Beijng is a direct outcome of the round table COST-G Sino-European Meeting that was taking place 16.-17. January 2020 in Bern. The aim of the team members is to join their effort for gravity field modelling, especially to investigate the added contribution from China to generate established combined time-variable models to be included in the Combination Service for Time-variable Gravity Fields (COST-G). In addition, the simulation of constellation design for Chinese gravity satellites will be performed to pave the way to multi-pair gravity missions for improving our understanding of mass redistribution between the hydrosphere, cryosphere, atmosphere, and lithosphere.