Abstract: Inviting tenders is one of the major means of government procurement which can effectively reduce investment cost，standardize the market economy and prevent corruption in purchasing. However，due to various reasons，abusive practices in bidding activities happen now and then. Conspired bidding is one of the problems in government procurement. Based on a summary of the forms of conspired bidding，this paper analyzes its causes from six aspects and puts forward the measures and policies for preventing conspired bidding. We hold conspired bidding can be minimized by standardizing inviting bidding notices，intensifying supervision，increasing penalties，strengthening police investigation，and by bidding through the Internet.

Key words: inviting tenders and bidding, conspired bidding, government procurement, bidder, bidding agency