The wing root joint of civil aircraft wing and center wing is essential in transferring the load from the wing to the mid-fuselage and the center wing. In this study, different forms of the lower panels’ joints of civil aircraft wing and center wing are summarized. The key points of the design of lower panels’ joints are given. Lastly, the load transferring characteristics of typical civil aircraft are analyzed, and it is shown that the material type of lower wing panels will affect the design of joints.