Analysis method for reducing calculation conservative property of structural fatigue service factor

The invention relates to an analysis method for reducing the calculation conservative property of a structural fatigue service factor. The method comprises the following steps: 1, acquiring fatigue data of an analyzed object through finite element analysis software; 2, extracting alternating stress components and temperature data of a section from a database of the finite element analysis software, and storing the alternating stress components and the temperature data; 3, acquiring a section from the fatigue data of the finite element analysis software, wherein the intensity Sn of primary stress and secondary stress exceeds 3Sm; 4, subtracting the stress caused by temperature loads from the acquired alternating stress, exceeding 3Sm, of the section to form new fatigue data; 5, acquiring alternating stress intensity Satmech caused by mechanical loads through the finite element analysis software, and reading alternating stress intensity Satther caused by thermal loads from the database of the finite element ana