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In order to analyze the fatigue life and wear loss of valve seat, a simplified approach was developed to predict fatigue life and wear loss, and a test was conducted to testify the prediction in this paper. Aimed at revealing the effect of mechanical load and thermal load on the fatigue life and wear loss of the valve seat at different camshaft speeds, the ABAQUS software and the experimental data obtained from the valve train test bed were used to predict the fatigue life, which was based on the energy method. The mechanical stress, thermal stress, temperature distribution depending on material properties, and thermal-mechanical coupling stress at different camshaft speeds have been considered in the finite element method simulation. Through analyzing finite element analysis model of valve seat and S-N curve, the fatigue life and wear loss could be both obtained.