Bidding document is the document provided by the Tenderee to the Tenderer for bidding work. The purpose of the bidding documents is to clarify the nature of the goods or projects to be purchased, inform the rules and procedures on which the bidding procedures will be based, and inform the conditions for concluding the contract. The bidding document is not only the basis for the bidder to prepare the bidding document, but also the basis for the purchaser to sign a contract with the winning bidder. Therefore, bidding documents play a vital role in the whole procurement process. The Tenderee shall attach great importance to the preparation of the bidding documents, and ensure that the bidding documents are rigorous, thoughtful, detailed and correct in content based on the principle of fairness and mutual benefit. The preparation of bidding documents is a very important and tedious work, which should be attended by relevant experts, and if necessary, consulting experts should also be invited to participate. Special attention shall be paid to the following aspects in the preparation of the bidding documents: ① the contents of all purchased goods, equipment or projects must be described one by one in detail to form the basis for competitive bidding; ② The formulation of technical specifications and contract terms shall not cause discrimination against any supplier or contractor who is qualified to bid; ③ The criteria for bid evaluation shall be open and reasonable. The criteria for bid evaluation that deviate from the bidding documents and propose new technical specifications shall be more practical and fair; ④ Comply with the relevant provisions of the national government, and properly handle any inconsistency.