The engineering pricing model has changed a lot since the implementation of pricing norms, especially the advocacy of unit price contract in the revised norms. It greatly affected the cost of the project's completion by the accuracy of comprehensive unit-price. This has brought great challenges to the bid evaluation. The experts of initial analysis of bidding identify problems analyze the reasons and give professional guidance by the check and analysis to bidding documents. This work can give advance to the bidding experts and owner; also can improve the quality of bid evaluation. The initial analysis of bidding is the trend of bidding evaluation in the future.