Considering the impact on the engineering construction scheme evaluation from risk attitudes, and uncertainty and complexity in decision－making environments, grey target evaluation method for engineering construction scheme was proposed by basing on prospect theory. Firstly, the linear transformation operator with the features of the“rewarding good and punishing bad”was used to standardize the original decision－making matrix. Second, the positive and negative clouts was determined, the positive and negative clouts coefficient were taken as a reference point to solve the prospect value function. The nonlinear planning model for the maximum of comprehensive prospect value of each engineering construction scheme was established. Then the optimum weight vector is solved and the order of each engineering construction scheme is determined. Finally, a city rebuilt the city main road construction scheme evaluation was taken as a example for analysis, and the evaluation results were in according with actual situation.