Legal analysis: If Party A does not take the initiative to sign the contract, it can urge the other party in writing to sign the contract. If Party A insists on not signing the contract, it can complain to the bidding management agency or request it to urge the signing of the contract. If Party A ultimately fails to conclude the contract within the specified time limit, it may file a lawsuit in court and claim compensation for losses.

Legal basis: "Tendering and Bidding Law of the People's Republic of China" Article 46 The tenderer and the winning bidder shall, within thirty days from the date of issuance of the bid winning notice, submit the bid in accordance with the bidding documents and the winning bid. Establish a written contract based on the person's bid documents. The tenderer and the winning bidder shall not enter into other agreements that deviate from the substantive content of the contract. If the bidding documents require the winning bidder to submit a performance bond, the winning bidder shall submit it.