China, like many other countries, has restrictions on the export of certain products for various reasons, including national security, environmental concerns, and adherence to international agreements. As of my last knowledge update in January 2022, here are some categories of products that may be subject to export restrictions in China:
1. Military and Dual-Use Goods: Items that could have military applications or dual-use goods, which have both civilian and military applications, are often subject to export controls.
2. Cultural Relics and Artifacts: Certain cultural relics and artifacts may be restricted or prohibited from export to protect China's cultural heritage.
3. Endangered Species and Wildlife Products: Products derived from endangered species, as well as certain wildlife and their by-products, are subject to strict export controls to prevent illegal trade and protect biodiversity.
4. Certain High-Tech Products: Some advanced technologies and products related to national security, such as certain electronics and telecommunications equipment, may be subject to export restrictions.
5. Radioactive Materials and Nuclear Technology: Items related to nuclear technology and radioactive materials are subject to export controls to prevent the proliferation of nuclear weapons.
6. Certain Chemicals and Hazardous Materials: Chemicals that could be used in the production of weapons or that pose environmental and health risks may be subject to export controls.
7. Drugs and Pharmaceuticals: Certain pharmaceuticals and drugs may be restricted due to regulatory considerations.
8. Strategic Minerals and Resources: China may impose restrictions on the export of strategic minerals and resources to ensure domestic supply.

It's crucial for exporters to check with relevant Chinese authorities, such as the General Administration of Customs, and to be aware of any changes in regulations. Additionally, exporters should be aware of import regulations in the destination country, as they may have their own restrictions on certain products.