Abstract: The performance of the main dam of the head reservoir at construction stage is observed for Yixing Pumped Storage Power Station. The constitutive model and calculating parameters are verified using the back analysis based on the prototype observation data. Its stress-deformation behaviors and stability against sliding are predicted using a combined method with numerical calculation, geotechnical centrifugal model tests and prototype observation. It is concluded that the concrete face rockfill dam combined with toe retaining walls is a good dam type suitable for complex topographical conditions, especially for head reservoir conditions of pumped storage power stations.