The original fatigue quality depends on the material and its processing technology,and the detail fatigue rating(DFR) represents the inherent fatigue capacity of a structure material.The DFR fatigue strengthes of forged TC21 alloy samples with different treatment processes were studied.The results show that shot peening can effectively improve DFRcutoff fatigue strength as much as 46%;under the same surface conditions,DFR base fatigue strength after reaming increases nearly 11 % than that after drilling,DFR...