Abstract: The offshore booster stations are mostly welded steel structures.Under long-term wave loads,welded steel structures,especially welded joints,are prone to fatigue damage and even destruction.Therefore,a reasonable assessment of the fatigue performance of sea booster stations is particularly important for structural design.Based on a 220?kV sea booster station,the finite element software SACS is used to establish a sea booster station model.According to "Fatigue Design of Offshore Steel Structures" （DNVGL-RP-C203:2016） and "Planning,Designing,and Constructing Fixed Offshore Platforms—Working Stress Design"（API-RP-2A-WSD:2014）specifications,and the fatigue life of the jackets and supports connection node--the circular pipe node is obtained.Also,the finite element model of the node is established using SACS software,the stress concentration coefficient of the node is calculated,and the fatigue life of the upper block and jacket connection node-the non-circular pipe node is obtained.Related work can provide reference for fatigue analysis of offshore booster stations.