The connection between wing and fuselage is very significant in aircraft design. It is necessary to study on mechanical behavior at WingFuselage connection. This paper gives two FE models (A and B) associated with different variants on WingFuselage connection. The results show that: 1) The trapezoidal panel of model B (or front triangle panel of model A) bears a part of load, reducing the load of the function of frame at rear spar position. Because the WingFuselage connection of model B is more softly, the problem of deformation compatibility at rear spar position will be relieved; 2)The rear triangle panel of model A is beneficial for fuselage panel which is bearing the force from main landing gear, but maybe more weight will be paid.