Three companies bid, and one of them was found invalid after the bid opening. Can the bidding continue? What if both companies are invalid bids?

According to the bidding law, if there are less than three effective bidders, it is necessary to re-bid.

Bidding Law of People's Republic of China (PRC)

Twenty-fifth bidders are legal persons or other organizations that respond to bidding and participate in bidding competition.

If individuals are allowed to participate in the bidding of scientific research projects that must be subject to bidding according to law, the provisions of this Law on bidders shall apply to individuals who bid.

Article 28 A bidder shall deliver the bid documents to the bidding place before the deadline for submission of bid documents. After receiving the tender documents, the tenderee shall sign and keep them, and shall not open them. If there are less than three bidders, the tenderer shall re-invite tenders in accordance with this Law.

Tender documents delivered after the deadline for submission of tender documents required by the tender documents shall be rejected by the tenderer.

According to Article 43 of the Measures for the Administration of Bidding for Government Procurement of Goods and Services, "If there are less than three suppliers participating in the bidding after the bidding deadline, the financial department shall handle it according to the following principles: during the bid evaluation period, if there are less than three suppliers who meet the professional requirements or substantially respond to the bidding documents, the bid will be scrapped and the bidding unit will be responsible for re-bidding."

Extended data:

Bidding Law of People's Republic of China (PRC)

Article 50 A procuratorial agency that, in violation of the provisions of this Law, divulges information and materials related to tendering and bidding activities that should be kept confidential, or colludes with tenderers and bidders, thus harming national interests, social interests or the legitimate rights and interests of others, shall be fined between 50,000 yuan and 250,000 yuan, and the directly responsible person in charge and other directly responsible personnel of the unit shall be fined between 5% and 10% of the unit fine;

If the acts listed in the preceding paragraph affect the result of winning the bid, the bid will be invalid.

Article 51 Where a tenderer restricts or excludes potential bidders with unreasonable conditions, discriminates against potential bidders, forces bidders to form a consortium to bid together, or restricts competition among bidders, it shall be ordered to make corrections, and may be fined between 1 10,000 yuan and 50,000 yuan.

Article 52 If a tenderer of a project subject to tender according to law discloses to others the names and quantities of potential bidders who have obtained the tender documents or other tender conditions that may affect fair competition, or discloses the pre-tender estimate, he shall be given a warning and may be fined at least 1 10,000 yuan and less than110,000 yuan; The person in charge directly responsible for the unit and other directly responsible personnel shall be punished according to law; If a crime is constituted, criminal responsibility shall be investigated according to law.

If the acts listed in the preceding paragraph affect the result of winning the bid, the bid will be invalid.

Baidu Encyclopedia-People's Republic of China (PRC) Bidding Law