Abstract: This paper briefly describes a method of detailed designing and predicting the fatigue life for structural joints under constant amplitude loads by means of the Stress Severity Factor conceptBased on the Stress Severity Factor concept, an approach for determining factors α and β is developed and some of their values are derived from fatigue tests.An approach dealing with the cratch is created by fitting test data, and the relation between the corrective S-N curves of structural joints and the S-N curves of materials is defined.More than 100 specimens of revited joints were tested. The test data obtained were compared with the analytical results favorably and thereby testified the feasibility of this method.In addition, the present method was employed to predict the full-scale S-N curves of structural joints for their preliminary design and gave quite good results under the given conditions.