I failed my doctoral thesis in Germany, and it is difficult to pass it when I return home. Studying in Germany, it is not easy to get a degree normally. Because the graduation thesis can't graduate, it's even more valuable. If you don't get a degree certificate when studying abroad, it means that the university has studied in vain, that is to say, you can't successfully apply for academic certification after returning to China, and this certificate is one of the necessary documents for international students to work abroad and settle in China. You should successfully pass your thesis in Germany.