Abstract: For resolving the superduty stress at the dam toe of nonoverflow dam section thescheme of prestressed cable anchorage were adopted by arranging 30 anchorage pores onthe two sides of the non-overflow dam section,and the single pore tension is 5 000kN,themaximum depth is 70m. Also establish a perfect quality management system during theconstruction. All these make the remedy quality firmly and raised the floodproofing standard to 100-year flood.