Abstract: This paper studied the mechanical behavior and load bearing capability of composite L-type frame specimen under tension loadings through experiments and FEM analysis, which can be used to predict the mechanical response of a typical composite cabin. The results show that delamination and matrix damage are the main failure modes of composite L-type frame under tension loading, and the discrepancy of load bearing capabilities basis on simulation analysis and test is acceptable, which is only 10.1%. Future research shows that better mechanical properties can be obtained by sticking metallic gaskets around the bolted holes. The results can be used as theory reference for composite L-type frame structure designing.