What materials do Japanese people need to transfer to China for short-term tourism (15-day visa-free) to visit family visa?

To be honest, you really have to go to the immigration control window to ask about this. Different places have different requirements for entry and exit. Whether you can apply directly at home or not depends on the immigration police officer.

The so-called family visit visa is also an L visa.

Shanghai’s requirements are

1. Submit your original valid passport and visa for inspection;

2. Submit the original registration certificate for temporary accommodation of overseas personnel in Shanghai and Copy;

3. Submit the completed "Foreigner Visa and Residence Permit Application Form" and 1 recent 2-inch half-length, full-frontal color photo without hat;

4. Submit Certification materials that are consistent with the purpose of application:

(1) If visiting residents in mainland China, submit the relative’s local permanent residence certificate or relevant certificate of actual residence and the original and copy of the resident ID card;

(2) If visiting overseas Chinese and residents of Hong Kong, Macao and Taiwan, submit their identity documents and the original and photocopies of proof of permanent residence in Shanghai for more than 6 months;

(3) If visiting permanent foreigners, submit The original and copy of the relative's residence permit or "Foreigner's Permanent Residence Permit", and a company application letter stating the relative relationship.