Whether the preliminary property contract is valid during the bidding and publicity period.

Yes According to the provisions of Article 42 of the Interim Measures for the Management of Tendering and Bidding for Early Property Management, it can be known that the early property service contract needs to be signed within 10 working days after the bidding result is publicized, or it can be signed during the publicity period, and it is not allowed to refuse to sign for any reason, so it is effective.