Abstract: Tests of pitting corrosion and intergranular corrosion of two Chinese stainless cladding materials are carried out according to standards of GB4334 7 84 and French RCC M MC1310. Under the water chemistry condition simulating pressurized water reactors(PWRs) coolant(temperature,345 ℃;B,800 mg/L;Li,2 mg/L), their stress corrosion and uniform corrosion behaviors are studied. The results show that no stress corrosion cracking in U shape samples is found and average static uniform corrosion rate is less than 2 mg/dm 2 after testing in high temperature borated water for 5 000 h. Both of stainless cladding materials have better corrosion resistance.