Construction surveying work is the fundamental work that runs through the entire process of engineering construction, playing a crucial role in ensuring the quality of engineering construction. The accuracy, layout principles, layout forms, and internal and external work of the construction surveying control network for large and medium-sized hydropower stations must comply with the requirements of the engineering project itself and relevant technical standards. Strict control and careful construction should be carried out at each step to establish a high-precision and user-friendly construction surveying control network.