Abstract: The fatigue crack developing law followed in consideration of the safety estimation code concerned in our country contributes to the derivation of the initial blinds damage safety design proccdurcs, as it is pointed out in the article which makes use of the major conception of control management for rapture safety estimation, finds out the relationship between the types and sizes of various cracks and the fatigue duration of components, and works out the engineering applicable rapture control curve.In addition to blinds, it is somewhat instructive to the fatigue duration design of general pressure vessel and pipelines as well.