In this paper,a new quantitative model for quoted price and decision-making on project has been built by means of Operations of Fuzzy Relations and a fuzzy set theory.The established model has many characters,such as multi-objective for bidding,combined subjective opinion with enlightened logic as well as low leanness on data on past project and competitor.There is a case at the end of this paper showing the whole idea and process of the model.This paper provided a new theory base for the contractors in China.