The deposit certificate requirement for studying in Japan is usually 200,000 RMB. If your sponsor is a professor, it does have certain advantages. But I still suggest that you must have a statement, and don't lose big because of small things. If you really can't support it at home, you can also apply for a study abroad loan at the bank. After all, it is a short-term use. As for parents' salary, most international students claim that it is basically above RMB /654.38+ 10,000/year. When filling in the materials, it must be cost-effective and not inconsistent.