legal ground
Article 15 of the Provisional Regulations of People's Republic of China (PRC) on Value-added Tax.
The following items are exempt from value-added tax:
(1) Self-produced agricultural products sold by agricultural producers;
(2) Contraceptive drugs and devices;
(3) old books;
(4) Imported instruments and equipment directly used for scientific research, scientific experiments and teaching;
(5) Imported materials and equipment provided free of charge by foreign governments and international organizations;
(six) articles for the disabled directly imported by organizations for the disabled;
(7) selling articles for personal use.
In addition to the provisions of the preceding paragraph, the items of tax exemption and reduction of value-added tax shall be stipulated by the State Council. No region or department may stipulate tax exemption or reduction items.