In the case that the substantive content of the contract is not involved, both parties can negotiate to make some minor modifications. According to Article 46 of the Law of the People's Republic of China on Tenders and Bids, the tenderee and the winning bidder shall conclude a written contract in accordance with the tender documents and the bid documents of the winning bidder within 30 days from the date of issuing the notification of award. The tenderer and the winning bidder may not enter into any other agreement that deviates from the substantive contents of the contract. If the bid invitation documents require the winning bidder to submit a performance security, the winning bidder shall do so. Article 47 For a project subject to tender according to law, the tenderer shall, within 15 days from the date of determining the winning bidder, submit a written report on the tender and bid to the relevant administrative supervision department. Who bears the responsibility of the bidding contract? In accordance with Article 59 of the Law of the People's Republic of China on Tenders and Bids, if the tenderer and the winning bidder fail to conclude a contract in accordance with the tender documents and the bid documents of the winning bidder, or if the tenderer and the winning bidder conclude an agreement that deviates from the substantive content of the contract, they shall be ordered to make corrections; A fine of not less than 0.5% but not more than 10% of the amount of the winning project may be imposed. Article 60 If the winning bidder fails to perform the contract concluded with the tenderer, the performance bond shall not be returned, and if the losses caused to the tenderer exceed the amount of the performance bond, the excess shall also be compensated; If no performance bond is submitted, it shall be liable for compensation for the losses of the tenderer. If the winning bidder fails to perform his obligations in accordance with the contract concluded with the tenderer, and the circumstances are serious, his qualification to participate in bidding for projects subject to tender according to law for two to five years shall be cancelled and announced, until his business license is revoked by the administrative department for industry and commerce. If the contract cannot be performed due to force majeure, the provisions of the preceding two paragraphs shall not apply. The above is the legal knowledge about whether the contract can be changed after the bidding and signing of the contract. Have you learned it?