Abstract: In order to predict the fatigue life of the welded structure more accurately,a finite element analysis model was established based on the fatigue test of T-joint. At the 50% survival rate,the displacement control model of verity method,the load control model of verity method,and the VOLVO method were adopted respectively to predict the fatigue life of the T-joint. It is shown that the calculate results of the load control model of verity method are more safe and the results of VOLVO method are more dangerous. The results of the displacement control model of verity method are the closest to the actual ones. Then,based on the test data,the flexible S-N curve of the VOLVO method was revised,and the results of the modified model can reflect the actual project accurately.