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Huadian Ningxia Lingwu Power Generation Co., Ltd.No.3 and No.4 Units (2×1,060MW) are the first 1,000MW class air-cooled ultra super critical power plants in the world.In air-cooled power plants, because the temperature of condensate is very high, mixed bed resin for condensate polishing (CP) requires high durability.For this requirement, high-crosslinked gel type cation exchange resin (CSK40) and porous type anion exchange resin (CPA12) were applied to CP in Huadian Ningxia Lingwu Power Generation Co., Ltd.No.3 and No.4 Units.The resins used in these power plants had still maintained high quality and performance after 3 years operation.Additionally, in the lab scale evaluation, CSK40 showed high oxidation resistant ability (durability), and CPA12 indicated superior PSS (Polystyrene sulfonate) adsorption capability which relates to the property of anti-organic-fouling.These results show the combination of CSK40 and CPA12 has high durability as mixed bed resins for CP.Therefore it is considered that this type of resin combination has high conformity to CP of air-cooled power plants in which the condensate temperature is very high and operating conditions are very sever for resins.