1, which damages the legitimate interests of the tenderee, bidders or the state, collectives and citizens and causes direct economic losses of more than 500,000 yuan;
2. Bribery to other bidders, tendering units and other participants in bidding activities by threats, deception and other illegal means;
3, although not up to the above amount standard, but because of collusion, received more than two administrative penalties, and collusion.
For the punishment of the crime of colluding in bidding, China's criminal law also clearly stipulates that bidders collude with each other in bidding and quotation, which harms the interests of the tenderer or other bidders. If the circumstances are serious, he shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention, and shall also or only be fined. Bidders and tenderers who collude in bidding and harm the legitimate interests of the state, collectives and citizens shall be punished in accordance with the provisions of the preceding paragraph.