In March 2016, when Tiangong-2 was not launched, the China Manned Space Engineering Office signed a Memorandum of Understanding on International Cooperation with the United Nations Space Station with the United Nations Office for Outer Space Affairs, and agreed to use the China Space Station to provide scientific experiments for countries. Opportunity, and in the future to provide in-orbit flight opportunities for other national astronauts or load experts.
In May 2018, the China Manned Space Engineering Office and the United Nations Office for Outer Space Affairs jointly issued a cooperation opportunity announcement to the UN member states, inviting member states to participate in the space science application around the China Space Station. After the announcement, a total of 42 project proposals from 27 countries were received.
Through the preliminary selection screening and review of the project evaluation and selection committee, nine projects including space tumor and stellar gas spectroscopy were successfully selected.