A multi-objective decision-making model of the overflow cofferdam was established based on the analysis of the requirements for construction time, stress, and flood control, then the pareto solution was obtained using the simplex method by constantly perturbing the weights. The approximate aspiration dot arrange method was used to sort the non-inferior solution sets corresponding to different construction speeds, through which the optimal decision-making plan for each construction speed was determined, and the final decision-making plan was then selected according to the construction speed limit. This model uses the constraints of the critical activity window period to simulate the construction time limit of the overflow cofferdam, and analyzes the relationship between the pouring intensity and the unit cost according to the construction technical characteristics of the cofferdam, and obtains the final decision-making plan after determining the optimal construction speed. This model takes into account the capbility constraints of the construction party, which is conducive to the decision-making of the design party. They can formulate an optimized scheme after considering the capabilities of the construction party.