I would like to apply to Freie Universität Berlin in order to get a letter of invitation. Do I need to contact the professor in advance?
It is not necessary to contact a professor before making an application to the Beijing Office of Freie Universität. The FUB Beijing Office will contact the professors you would like to work with anyhow. This is part of the evaluation process. All decisions about the acceptance of individual candidates for a doctorate at Freie Universität Berlin are made by the potential supervisors in Berlin.