Legal Analysis: According to Article 41 of the Measures for the Administration of Invoices in People's Republic of China (PRC) (Detailed Rules for Implementation), "Units and individuals who use invoices shall keep them properly and shall not lose them. If the invoice is lost, it should be reported to the competent tax authorities in writing on the day of loss and declared invalid in newspapers, television and other media. " Please go through the above procedures before going through the following procedures: 1. Consumers who lose invoices go to the sales unit to ask for a copy of the invoice stub (stamped with the special invoice seal or financial seal of the sales unit); 2. Go to the local competent tax authorities of the seller's place to stamp for confirmation and register for the record; 3. The sales unit reissues the sales invoice that is consistent with the original sales invoice stub.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 463 This Chapter regulates civil relations arising from contracts.

Article 464 A contract is an agreement between civil subjects to establish, change or terminate a civil legal relationship.

Agreements on status relations such as marriage, adoption and guardianship shall be governed by legal provisions on such status relations; If there are no provisions, the provisions of this part can be applied according to their nature.

Article 465 A lawfully formed contract shall be protected by law.

A legally established contract is legally binding only on the parties, except as otherwise provided by law.