【正文】 timate purpose. Objective to know the direction of audit supervision, also was made clear. From the time point of view, the use of strategy occur very early, even early in the contract before it has implemented. From the strategy whether successful implementation, although strategy early in the bid when it has been used, but whether successful, achieve optimal economic benefits, but also in the subsequent construction process gradually, therefore, if the construction of thesis worryfree process good close, also can prevent the part of policy implementation. From the strategy use conditions, the Contractor does not affect the successful premise, use construction project uncertainty, foreshadowing, with a view to gaining extra profit. Therefore, construction of the uncertainty is strategy condition, if the construction design drawings, engineering quantity calculate accurate clear, almost no change, increase the project, then foreshadowing will not proceed with, the use of strategy limited. Although before the work started, to do so reach the acme of perfection, is very difficult to achieve, but the audit should play a role in that respect, urge or supervision of the owners as possible, prevent individual project management, the project uncertainty, engage in corruption, embezzlement of state property. 5 The qualitative analysis method, is the use of decision makers in logical thinking and reasoning ability to make bidding decision method. Decisionmaking on the premise that the enterprise should widely collected, system accumulate a large amount of information. The enterprise is only in possession of large amounts of information, know yourself as well as the enemy, seize the opportune moment to thorough research can reduce the price, easy to win the bid, also can cause the enterprise to reduce the loss of profit pricing scheme. According to the survey of some enterprises bidding, bidding strategy research, has the following several aspects: the advantages of lower cost to gifted victory A business advantage in many aspects, such as high quality employees, advanced technology and equipment, advanced construction technology, materials turnover flexible management mechanism, keenwitted and capable, high efficiency. Enterprises in the quotation, can be bined with the actual situation, put their own advantages into the lower price, for example, employees high quality, high efficiency, labor, labor costs can be reduced. In order to effectively reduce the project cost, raise the petition winning probability and reduce the loss of profit. High price strategy. According to the characteristics of project of invite public bidding, the contractor in case often uses the high price quotation strategy. (1) the poor conditions of the construction project。 (3) special projects, such as: underground excavation worry thesis work engineering, bridge engineering。 bidding rival ) less engineering。 engineering project, cost reducing, engineering settlement increased quantities may obtain extra ine worry thesis work or reduce the engineering quantity 6 reduce the loss. The design drawings are not clear, is not plete, estimated by the