Abstract: A project bidding transaction management system in accordance with a preferred embodiment of the present invention includes a database server (1) for storing data used or generated in implementing the project bidding transaction management system, and an application server (2) for managing project bidding transactions. The application server includes: a basic data maintenance module (20) for receiving requirements of outsourcing projects, and generating specifications for the outsourcing projects; a bidder selection module (21) for selecting a plurality of suitable bidders from a list of companies wishing to bid on an outsourcing project; a price negotiation management module (22) for performing price negotiations with bidders, and generating price negotiation records; and a bid comparison module (23) for determining a winning bidder as a contractor for each outsourcing project, and generating bid results. A project bidding transaction management method is also disclosed in the present invention.