As an important part of the whole bidding activity, the quality of the preparation of the bidding documents determines the success or failure of the bidding activities and the smooth implementation of the bidding project. Bidding documents refer to the documents prepared and sold by the tenderee to the tenderer, including clear qualification conditions, contract terms, bid evaluation methods and response format of bidding documents. Bidding is an appointment procurement, so the bidding document is an offer. The bidding document is to determine the requirements and all conditions of procurement in the form of agreement in the tender. Therefore, the function of the bidding document is to clarify the nature of the procurement object, and inform the conditions of the contract through the rules and procedures to be followed by the bidding activities. The bidding document and the part are not only the basis for the bidder to prepare the bidding documents, but also the basis and basis for the buyer to sign the contract with the winning supplier. It is an important and very trivial work to prepare bidding documents. In the preparation of bidding documents, it should be based on the principle of fairness and fairness, so as to make the bidding documents strict, thoughtful, meticulous, easy to receive and standardized. The preparation of bidding documents is conducive to control the project investment. The project bidding certificate of the past years in the world and domestic shows that the final cost can be saved by about 8% after the project bidding. The main reason for these cost savings is the improvement of construction technology and the rationalization of construction organization. In addition, transaction costs can be reduced. The cost of the project is reduced by saving manpower, material resources and financial resources. It is helpful to ensure the quality of the project. The project already built is the performance of the enterprise. It will not only play a role in the evaluation of its qualification, but also have a crucial impact on other projects in the future. Therefore, the enterprise will put the project quality in an important position. It is conducive to the better choice between supply and demand, and makes the project cost more in line with the value basis. The preparation of bidding documents can consolidate the professional knowledge and be familiar with the project cost