Abstract:As the lower reservoir of pumped storage power station in Weifang Municipality, Songshan Reservoir undertakes an important task of hydraulic energy storage. The safety of Songshan Reservoir Dam directly affects the normal operation of the pumped storage power station. In view of the requirement to raise the dam elevation, different heightening and thickening design schemes are proposed to select the safest, most reliable, economical and reasonable scheme. The construction process and key precautions during construction are briefly discussed, which can offer references for reservoir projects under similar conditions.