Legal analysis: sign the contract within 30 days after the announcement of winning the bid for the information project. Under normal circumstances, after winning the bid, the bidder and the tenderee should further negotiate and sign a written contract after reaching an agreement. The time limit for signing the contract after winning the bid is generally within 30 days. Therefore, after winning the bid, both parties should pay attention to the time of signing the contract and sign the contract in time to avoid unnecessary trouble caused by invalid contract. For projects that must be subject to tender according to law, the tenderer shall also submit a written report on the bidding situation to the relevant administrative supervision departments within 15 days from the date of determining the winning bidder.
Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not adopt a written form, but one party has fulfilled its main obligations and the other party has accepted it, the contract is established.