Determine when to sign the contract after winning the bid.

Legal analysis: the contract must be signed within 30 days from the date of issuance of the bid-winning notice. After the contract is concluded, the winning bidder shall fulfill its obligations in accordance with the contract and complete the winning project; The winning bidder shall not transfer or transfer the winning project in disguised form. The transfer of the winning project means that the winning bidder transfers the winning project to others, making others become the actual finishers of the winning project. The transfer of the winning project is very harmful in practice, which makes the bidding ineffective and has a serious impact on the project quality. Judging from the legal relationship of the contract, the transfer of the winning project is a breach of contract that changes the subject of the contract without authorization.

Legal basis: Bidding Law of People's Republic of China (PRC).

Forty-fifth after the winning bidder is determined, the tenderer shall issue a letter of acceptance to the winning bidder and notify all bidders who have not won the bid. The bid-winning notice has legal effect on the tenderer and the winning bidder. After the bid-winning notice is issued, if the tenderer changes the bid-winning result or the winning bidder abandons the bid-winning project, it shall bear legal responsibility according to law.

Article 46 A tenderer and a winning bidder shall, within 30 days from the date of issuance of the bid-winning notice, conclude a written contract in accordance with the tender documents and the bid documents of the winning bidder. The tenderer and the winning bidder shall not conclude other agreements that deviate from the substantive contents of the contract. If the tender documents require the winning bidder to submit the performance bond, the winning bidder shall submit it.