June 6th 2017, during the global space exploration conference (GLEX 2017) the administrator of China National Space Administration (CNSA) Tang Dengjie held a bilateral meeting with president of the German Aerospace Center (DLR) P. Ehrenfreund with the topic of further deepen Sino-German space cooperation. Tang and Ehrenfreund witnessed the signing of the letter of intent of Sino-German cooperation on Chang'e IV Mission. Wu Yanhua, vice administrator of China National Space Administration, attended the meeting and signed the letter of intent on behalf of the China National Space Administration.