The incremental launching method is widely used in all kinds of bridge construction. In view of the shortcomings of the current incremental launching calculation and the traditional method of incremental launching beam assembly construction control, this paper proposes an incremental launching calculation method based on nonlinear analysis for the first time, which can truly simulate the running state of the beam, that is, the incremental launching buttress is not moved and the beam is moved forward. The calculation results can directly give the assembly line shape of all segments of the beam and the real line shape of the beam under the specified working conditions. The prefabricated line shape of the main beam, that is, the unstressed line shape, does not need to be consistent with the slide line shape. When the two are inconsistent, the main beam will automatically adapt to the slide line shape without manual intervention. The whole process finite element modeling calculation is carried out for the background project. The calculation results show that the finite element modeling is carried out by using this jacking calculation method, and the calculation results can directly give the accurate theoretical assembly line shape of the beam body. The reaction force state of the jacking pier is related to the stress state of the main beam, and the elevation adjustment of the top surface of each pier only affects the reaction force of the current pier and the adjacent pier. The alignment of the slipway can be preliminarily formulated as the design alignment of the bridge. According to the reaction force of the pier and the stress change curve of the beam, the optimization of the slipway alignment can meet the requirements of the jacking control.