In order to get the biggest bid winning probability and margins for construction enterprises when bidding,a multi-objective decision model was proposed by combining the principle of lowest bid which can achieve the largest successful bidding probability and the most profitability.Moreover,the above model was converted to a bid model which can maximize the expected profit margins.According to the problems of funds for construction enterprises,bank deposit rates and lending rates,optimal bidding price models were respectively given in the three cases of without thinking about the money,considering lending rates and considering deposit interest rates.Besides,the corresponding winning probability and profit margins were also presented providing a bidding basis for construction enterprises with different economic strength.The models and results,after analysis,show that the optimal bidding price is mainly determined by the engineering cost.