Generally, projects approved by the Development and Reform Bureau need to enter the local trading center for public bidding. At present, the government and the financial sector, the project cost of 4 million or less, you can go to the financial competitive negotiation, competitive negotiation, single-source procurement and other procedures, do not need to go to the trading center bidding. Engineering projects in more than 4 million, need to be approved through the development and reform bidding, to the trading center bidding.