Abstract: The effective elastic constants of composite were calculated by three-dimensional equivalent method. The balanced three-dimensional finite element model of composite solar array connector was built to analyze the strain distribution. According to the Hoffman failure criterion, the strength envelope of different positions of the solar array connector was obtained. The strength of the solar array connector structure was checked by comparing the strength envelope with simulated strains of the connector. The static tests were conducted on composite solar array connector to verify the accuracy of finite element simulation results. The results show that the strain distribution results of solar array connector under external loads by finite element simulation were similar with the experiment results. The relative error of strains in 0° direction at the joint of main girder and sleeve was lower than 9.00%. The relative error of strains in 90° direction was slightly larger than that in 0° direction, with the maximum value of 13.30%. The strength check results of the solar array connector structure were consistent with the static testing results. The end of the joint and orthogonal turning point of the sleeve were the weak points of the solar array connector.