In order to evaluate the fatigue life of the suspension bearing beam, fatigue testing and analysis methods for welded structures are studied. Combined with CAE, the principle of load spectrum point placement is put forward. Based on the strain testing technology, the road load spectrum of the key points of the bearing beam is collected to obtain the dynamic stress. Dynamic signed VonMises stress is synthetised from strain rosette data. The SN curve of the suspension bearing beam structure is determined based on the theory of welded structure classification. The parameters related to welding structure performance are studied. And the fatigue life prediction is finished based on the theory of rain flow counting and damage accumulation.Compared with the reliability test result in laboratory, the result is good.A complete set of fatigue analysis method for welded structures based on measured load spectrum data is formed.It is proved that the fatigue analysis method and process can effectively predict the fatigue life of welded structures.