A, the bidder insider shady 1: differential treatment refers to the bidder to different bidders to provide information is not consistent, for their own preferred, there is a transfer of benefits to the supplier to provide more accurate project news. These differences in information is very likely to affect the final offer, so that the "fixed" supplier won the bid. Inside the winning unit, bidding pure go process, all kinds of bidding, all kinds of change evaluation scoring, change the offer, etc., there are very extreme, the bidder's main leader in the external company to set up their own bidding. Shady 2: revealing the bidding important information to the bidders, such as bidding or control price, bid evaluation personnel, bidding opponent list and so on. Shady 3: dissuade the most competitive units, so that he negotiated not to reduce the price, the internal unit of the counter overtaking. Shady 4: set up a variety of entry thresholds, equipment, technical barriers are more common. Shady 5: picking faults in the bidding documents, and strive to abolish a certain unit of the standard, open bidding is more common. Shady 6: not according to the bid evaluation methods, bid evaluation results are not public. Shady 7: the use of bid evaluation methods of additional points and internal unit collusion, such as letting the internal unit commitment to advances, against the house, acceptance of commercial paper and other additional points, the actual implementation of the actual implementation of these do not perform. Shady 8: according to the authority level division bidding sphere of influence, such as the old master which, engineering manager which, bidding for the person in charge of which. Shady 9: who won the bid all eat, that is, all bidders are required to consider the bidder's rebate in the offer. Shady 10: the bidding documents specify the brand, the specified brand is not in the same class or imply that the bidders must choose a brand. Some purchasers will be in the tender documents directly specify the procurement of a manufacturer's products and services, or in a roundabout way to specify a specific specification of a major product, and the specifications of the model is actually only the only one manufacturer production. Second, the bidder insider shady 1: collusion is also known as collusion to win the bid, refers to the bidder and the bidder collusion with each other to win the bid. Shady 2: rely on qualifications, this is not much to say, very common. Shady 3: bribe to the bidder, this goes without saying. Shady 4: report competitors, report to the regulatory authorities or bidders, the key moment to smear. Shady 5: offer strategy, including unbalanced offer, low price after winning the rip-off, a variety of claims and visas, after winning the bid to buy through the administrator to supervise the change of supply brand and so on. Shady 6: the use of loopholes in the bidding documents to the second best or omission, etc., this is too much. Shady 7: tampering, if the bidders know what units are invited to bid, then nine out of ten to be tampered with. Shady 8: bid-rigging is also common in the industry, "invited to accompany the bid", refers to several bidders to agree with each other, the same raised or lowered bidding price for bidding, by restricting competition, crowding out other bidders, so that a stakeholder to win the bid. Shady 9: Various trade associations guide the price, so that the original fully competitive industry into a semi-monopoly, each unit of the offer staff are centralized office, the winning unit assigned in pieces, taking turns to win the bid. Shady 10: spread the information that the bidders have been internalized, so that other bidders to give up their bids. Third, to avoid the pit strategy 1. look at the tender time if the tender purchase time cycle is more rushed, for example: within a week, need to work overtime to rush to complete, it is likely to have been internalized, to go through the process, we are cautious to participate in the 2. look at the bidding parameters and scoring standards bidding documents in the parameters and scoring criteria is the core, get the bidding documents, the first to look at the bidding for the qualifications of the supplier as well as the product parameter requirements If there is an obvious tendency, such as the above mentioned: direct or implicit designation of specific brands and manufacturers, the probability is that there has been an internal object. On the contrary, if the bidding documents inside the requirements of the qualification, product parameters and scoring criteria are very broad, without much restriction. This kind of even if party A has the intention of the company, the results of the impact is also limited. This type as long as the price, service, product advantages, plus a little luck, the possibility of winning the bid is still quite large.3. Look at the bidder's previous projects by checking the bidder's previous projects by the partner, you can clearly understand whether it has a fixed cooperation enterprise. If 80% of the previous project for the same supplier won the bid, then the possibility of internalization is greater. If the previous bidder's project is not fixed, the winning enterprise is more dispersed, you can participate in the bidding.4. Concerned about the bidding announcement changes or abortive bidding information There are some bidding projects, may be due to the lack of publicity, resulting in the number of bidders is not enough to 3 people. The bidding party will change the bidding announcement, or the project directly abortive bidding, can only bid again. This kind of bidding record with abortive bidding, the probability is that there is no internal object, you can participate in the bidding.