The Xiangshan Bridge under construction is a semi-floating system cable-stayed bridge with double pylons, double cable planes and double-deck steel truss girders. The main span of the bridge is 880 m. The pylons are herringbone-shaped, with only corbels at the beam bottom and no crossbeams. The axis of the pylon limb is 9.9 ° to the plumb line, and the cantilever length is 165.8 m. The cantilever length of the inclined pylon limb is rare. In addition to ensuring the safety of pylon construction, reasonable design schemes of temporary lateral bracings should also facilitate the construction of pylons and temporary lateral bracings, so as to save the investment of temporary lateral bracings. Aiming at the shortcomings of setting too many active lateral bracings (increasing unnecessary measures and costs) caused by the traditional force safety principle ' the horizontal displacement of the inclined pylon limb does not exceed the allowable deviation of the axis and the stress of the pylon limb does not exceed the standard ', a new simplified force safety principle ' the stress of the tower limb does not exceed the standard ' is adopted to determine the temporary lateral bracings. Through the simulation calculation of each pylon construction stage by the finite element software Midas Civil, combined with the structural characteristics of the Xiangshan Bridge pylon and the hydrological and meteorological conditions of the bridge site, the design scheme of the temporary lateral bracings position, section size, active force size and demolition sequence for the Xiangshan Bridge pylon is studied and determined. The number of temporary lateral bracings in the obtained design scheme is small, and only one layer of active bracings is set. Using the obtained lateral bracings design scheme, the construction of the pylons is smooth (it is about to cap), no cracks are generated, and the axis deviation of the tower is within the allowable range of the design.