Abstract: In this paper, the finite element method was used to simulate and analyze the tensile properties of several pre-molded lap composites with different lamination sequences respectively. The corresponding joggle-lap joint samples were prepared by using domestic carbon fiber and rapid curing epoxy resin. The tensile properties of the lap were tested, and the results of finite element calculation were verified. The calculated results obtained by finite element method are basically consistent with the experimental results. It's found that there are two different failure modes of the preform lap joints with different stacking sequence. The interlaminar peel strength and the flexual property of the plate both determine the failure mode and tensile performance.The weaker damages first, resulting in the failure of the sample. In the preform lap joint, the closer the 0° ply lay to the lap face, the more obvious the influence on lap bonding performance is, and the lap strength performs better. And different relative angle between the fiber layers leads to different stiffnesses distinction. The bigger the difference is, the weaker the joint performs.