Compound bidding is a special way of reasonable bidding. The base price of a project is obtained by the weighted and uniform combination of the owner's base price and the bidding price of each bidding unit, which is called "compound base price". The final offer of each bidding unit is different from the bid price comparison of the owner, and the error is within the scope of the owner's rules (generally - 20% ～ + 10%), which is called "the first shortlist". The average value of final offer (30% - 40% weight) and the owner's base price (60% - 70% weight) of the first shortlisted bidding units are weighted evenly, and then the composite base price is obtained. After that, when the final offer of the first shortlisted bidding units is compared with the re composite base price, if the error is within the scope of the owner's rules (generally - 15% ～ + 15%), it is called "the second round".
For the second time, the shortlisted bidding units obtain the qualification of candidate winning units, and the owner will arrange personnel to comprehensively evaluate the bidding documents of these units, and calculate the overall bidding scores of each unit. No matter whether it is shortlisted for the first time or not, all the bidding units that are not shortlisted for the second time are "flying bids", and such bidding units have no qualification for winning the bid. Therefore, in the process of bidding for composite bidding projects, in addition to the analysis of the owner's base price, we should also consider the bidding price of competitors, and calculate the general scope of the composite base price.
In addition to the analysis and consideration of the above-mentioned different quotation types, we should also pay attention to the following problems: first, when the same project has multiple bidding sections, the final quotation of each bidding section should not be at the same standard level, and there should be a certain degree of ladder. That is to say, for the final offer based on the normal budget, there must be a certain step difference between the ups and downs of each bid section, so as to ensure that the offer of one bid section is close to the optimal offer, and the overall "flying standard" phenomenon will not appear. Second, it is a difficult but practical job to analyze and study the bidding quotation of competitors so as to know each other. If we can analyze the quotation of competitors thoroughly, we can not only make our own quotation superior to that of competitors, but also prevent too much reduction of the quotation in order to win the bid, and then get better economic benefits after winning the bid. The more uncertain the situation is, the lower the price will be.
In a word, it is a systematic and disorderly operation to calculate and confirm the bidding price after all. There are many factors that can not be confirmed, so we need accumulated experience to analyze and judge. Therefore, as a contractor, we should pay attention to the accumulation of project bidding experience to obtain the greatest success of project bidding.