Although corrosion fatigue has been studied by many investigators, no report so far describes the corrosion fatigue under different corrosion atmospheres and stress conditions. In this study, a few corrosion fatigue tests have been made to clarify the effects of environmental conditions and of the superimposed wave or varing stress.The results obtained are as follows;(1) The atmospheric corrosion fatigue strength of S35C specimen (ρ=10R) under rotating bending (n=3600rpm) decreased by about 20∼30% as compared with the value obtained by the non corrosion fatigue test. And the fatigue strength decreased markedly after one month's exposure to atmosphere.(2) The fatigue life of SS 41 specimen, subjected to repeated wetting with 3% NaCl and drying under superimposed wave, became very short when the stress of the second wave was very small. This arises from the double effects of corrosion and superimposed wave.(3) The corrosion fatigue test on 13% Cr-Mo steel under varing stress in 3% NaCl showed that the fatigue life decreased extremely as compared with the corrosion life under constant stress.