Fatigue test of butt welds of Q690 high strength steel was carried out by simulating the corrosion environment in the splash zone through humid and hot immersion environment. The effects of corrosion damage and weld defects on its fatigue properties of high strength steel were analyzed. The results show that the butt welds of Q690 high strength steel has good fatigue resistance. When the corrosion period is 100 days， the mass loss rate of the specimen is 8.46%， the average corrosion rate of the weld zone and the heat affected zone was 1.14 and 1.22 mm/a， and the fatigue limit is reduced by 32.7%. The fracture crack distribution of the rusted specimen crack is in parallel banded. With the increase of corrosion damage degree， the number of fatigue stripes under high stress level decreases and the damage accumulation increases significantly.