1. Invoice: The commercial invoice must include the following items: invoice number, contract number, date, buyer's company name, port of shipment, port of destination, shipping marks, product name, quantity, unit price, total price, etc. The content of each item must be consistent with each other.
2. Packing List: The packing list includes all items of the invoice except unit price and total price. In addition, it must also include the number of packages, gross weight, net weight, and dimensions (i.e., volume). No alterations are allowed on the original document.
3. Sales Contract: It mainly highlights the contract number and transaction terms, while other columns are similar to those in the invoice.
4. Power of Attorney for Customs Declaration
5. Handwritten/Printed Customs Declaration Review Form
6. Supervision Conditions and other documents deemed necessary by the customs.

Due to the system upgrade, starting from January 1, 2018, two additional elements have been added to the export customs declaration: Brand Type and Export Preferential Status.

• Brand Type: Refers to the brand attribute of the exported goods, such as whether it is a well-known brand, a general brand, or a non-branded product, which needs to be declared in accordance with the actual situation of the goods.
• Export Preferential Status: Indicates whether the exported goods are eligible for preferential policies (e.g., preferential tariffs under free trade agreements). Enterprises need to declare truthfully based on the preferential policies applicable to the destination country/region of the goods.