Bidding information is not all clear in the hydraulic engineering bid evaluation,so we undertook two steps to solve the above problem.First,according to the index system commonly used in bidding evaluation of hydraulic engineering,the weight of each evaluation index was determined by Delphi method.Second,the Interval intuitionistic fuzzy matrix is established,then selected the optimal from the alternatives by calculating the value of compound distances between alternatives and positive and negative ideal solutions,by means of applying the concept of weighted Hamming distance.This method makes the evaluation information quantitative,reducing errors due to subjective factors,so the results will be more objective and accurate.Through a hydraulic project example to illustrate the application of the method,the result is that the best solution is A4 and the worst is A1,showing that this model works for hydraulic engineering were optimized for each bidding evaluation program objective,reasonable and effective.