English：

To investigate the design method of unbalanced bracket for side span cast-in-site segment of multi-low-tower cable-stayed bridge, and meanwhile develop the corresponding construction process. The design method of unbalanced bracket was firstly proposed according to the structural features of side span cast-in-site segment of Xila Mulun River Bridge. Secondly, by considering the external loads of unbalanced bracket during construction of side span cast-in-site segment, the mechanical properties of unbalanced bracket were researched through finite element simulation, including the deformation and material strength redundancies. The mechanical control points for the local structures of unbalanced bracket were also provided. In the last, the construction process of side span cast-in-site segment based on unbalanced bracket was summarized according to the engineering practice of Xila Mulun River Bridge, and the construction precautions related to unbalanced bracket were pointed out. The results show that the maximum vertical deformation of the designed unbalanced bracket under construction loads is 3.14mm, which can meet the requirement of deformation control. The redundancies of material strength are greater than 29.6%, which can meet the safety requirement. The redundancies of material strength of local structures are greater than 65.5%, which has a higher safety redundancy. The engineering application in Xila Mulun River Bridge indicates that the designed unbalanced bracket has a good applicability. It is suggested that in the following engineering practices, the central region of bracket corresponds to the central of box girder can be further reinforced.