This report describes repair methods applied to the bridge piers (Nos.P7&P8) damaged due to chloride induced corrosion together with seismic strengthening applied in 2001-2002, It is required that economical concrete mixes and construction methods, which are applicable to the concrete structures damaged due to chloride induced corrosion under any climaticenvironment, will be developed.(selection of section recovery material, deal with change of concrete, )