Procurement document preparation refers to the process of organizing and recording information on transactions, settlements, or other business operations that need to be carried out during the procurement process in documents. This process can be conducted in both paper and electronic form, with the aim of facilitating the management and recording of relevant business information. In procurement documentation, the principles of preparing documents include the unity of letters of credit and contracts, the unity of documents and letters of credit, the unity of documents and goods, and the unity of documents and documents. These principles ensure strict consistency between the documents and the conditions stipulated in the letter of credit, in order to meet the content and key points specified in the contract, as well as the actual data and content of the goods.