The water environment of pressurized water reactor is high pressure and high temperature,meanwhile,in order to protect steam generators,the water chemistry in the secondary loop of PWR is required to be high in pH and low in dissolved oxygen(DO).However,under this water chemistry condition,the carbon steel piping of secondary loop is prone to flow accelerated corrosion(FAC),a corrosion mechanism in which a normally protective oxide layer on a metal surface dissolves in fast flowing water,and underlying metal corrodes to recreate the oxide,and thus the metal loss continues.The purpose of this paper is to build a device which can simulate the secondary loop of PWR.The device has the required velocity,temperature and pressure,and can control the pH,DO and other parameters.It can be used to study the effect of pH,DO and velocity of FAC.The corrosion data of carbon steel in PWR secondary loop can be obtained from this device.