Instead of issuing a bidding announcement, the company can also issue a bidding invitation letter to some units, which is also a common method for project bidding.

The invitation letter can be issued through the system platform or sent by postal channels.

For some special projects that can meet the construction qualification requirements, they are basically within the system (such as offshore platform construction), so public bidding is not very meaningful. For these projects, the invitation bidding model is basically adopted.

Enterprises must publish bidding announcements on relevant platforms for bidding. Failure to publish is illegal bidding