How to prevent bidders from maliciously colluding and bidding?

A, to prevent the tenderer and bidders collusion.

(1) Invite experts to review the bidding documents to prevent tendentious opinions.

(2) In the evaluation criteria, objective facts should be taken as the evaluation criteria as far as possible to prevent the tenderer from abusing his discretion.

③ Conduct post-event inspection and contract supervision on the winning contract.

(4) Discipline inspection and supervision should participate in the whole bidding process.

Second, measures to prevent bidders from colluding:

(1) Invite bidders who have long-term cooperation to participate in bidding, and they usually keep a correct attitude to participate in the competition;

(2) Introduce a group of new bidders to improve the bidding difficulty.

③ Set certain qualification requirements such as performance, reputation and strength. For bidders with certain qualifications, they are usually reluctant to participate in bid manipulation.

(4) Strengthen market investigation, understand the market situation and find collusion.