Abstract: Project bidding evaluation is of vital importance for owners to select the most suitable contractors to complete the project successfully. In order to improve the reliability and convenience of existing methods, TOPSIS model is introduced into project bidding evaluation. Through analyzing the special meanings of weighting for bidding evaluation indexes, this paper proposes a combination weighting method integrating Delphi-AHP and entropy method, which not only reflects decision-makers’ subjective preference but also highlights the objective differences of schemes. Then, the project bidding evaluation method based on combination weighting TOPSIS is established. Finally, a case study is given, which shows the method introduced in this paper is feasible and efficient, and has better differentiation degree and decision accuracy