An experimental scheme of studying the fatigue life of the turbine casing slot was presented. With the scheme

the stress field of the critical section was obtained by numerical analysis

and mechanical loading was applied to simulate the total stress field of the critical section at room temperature. Under the load

the fatigue life of the turbine casing slot can be obtained. Using the proposed scheme

structural improvement measure of new turbine casing

modification measure of old turbine casing and the effect of corrosion were evaluated experimently. The results show that: (1) rounding the new turbine casing slot corner with a 0.8mm-radius can increase the safe life by 69% and 198% with confidence of 50% and 95%

respectively; (2) a fatigue life similar to the new turbine casing slot can be obtained through cutting a 1.5mm-radius corner on the old turbine casing slot; (3) corrosion can affect the fatigue life of the turbine casing slot significantly.