According to the provisions of the tender documents, if the tender documents indicate the original as the main original, the original stamped with a red seal can be used, and the copy can be copied.

The purpose of stamping page by page is to avoid the risk of bidders' disapproval. Whether to seal page by page mainly depends on the requirements of the tender documents, which parts need to be signed and sealed, and those that are not needed can be left blank. However, it is suggested that every page should be stamped, except the catalogue and back cover, and all copies and text parts in the tender should be stamped. When stamping the copy, it is best to stamp it in the blank space of the copy, and do not overlap with the original official seal on the qualification certificate for the convenience of the judges.

Under normal circumstances, legal persons and bidding agents do not need to stamp the bidding documents, but only need to sign them. If the tender documents require this, they can be stamped as required.

When using electronic signature to authenticate electronic bidding (digital certificate is required to participate in bidding), it is no longer necessary to stamp. It is unreasonable to require electronic seal or paper document before scanning and uploading.