Abstract: Effects of fillet angle on tension-shear strength of single lap joint were studied by testing, and corresponding finite element model was built, and the effect of fillet angle on shear stress and peel stress distribution in the joint was analyzed. The results show that the peak shear stress and peel stress in the point were higher when the fillet angle was 0°. The peak shear stress and peel stress at the end of joint firstly increased and then decreased with the incrense of fillet angle from 30° to 90°. The highest tension-shear strength was obtained for the joint with a fillet angle of 30°, which was attributed to relatively low peak shear stress and peel stress. The results of finite element simulation were agreement with the experimental results.