Abstract In recent years, the project presents the characteristics of increasing construction scale, construction complexity, and attrition cost, and efficient engineering modeling and dynamic simulation technology become the key issues in the field of engineering information construction. BIM technology, as an effective technical means of engineering modeling and dynamic construction organization, is the hotspot of the current attention to the digitization of construction engineering. Aiming at the information dispersion and contact problems existing in this model, this paper optimizes the engineering BIM integration model by using the construction dynamic construction simulation method and the augmented Lagrangian multiplier method, respectively. In this paper, a drainage network renovation project in Tianjin is used as an experimental object, and the engineering BIM integration model is used to set the simulation parameters and working conditions. After comparing the numerical simulation results with the monitoring data, it was found that the overall trends of the two results are similar. The use of numerical simulation technology in the construction process resulted in a cost saving rate of 1.88% and a schedule advance rate of 3.01%. The effectiveness and superiority of the integrated engineering BIM model in specific projects have been verified.