Abstract: The theorems, laws, and conclusions of engineering mechanics are important foundations for solving practical engineering problems, and also provide a scientific theoretical basis for the optimization of construction technical solutions. The article analyzes and summarizes the process of successfully applying the theoretical knowledge of engineering mechanics to optimize the construction technical scheme of water conservancy and hydropower construction projects. The purpose is to further improve the optimization level of optimization technical schemes of construction enterprises and ensure the scientificity, safety and security of construction project technical schemes.Operability, reasonable increase of economic benefits, and the same time provide reference for similar engineering projects.