As one of the most important temporary facilities in the construction of suspension bridge cable system, it is very necessary to optimize the design of tower top gantry from the perspective of cost control. In this paper, the background of Tongji Bridge in Guigang City is studied. Based on the principle of technically mature and economically reasonable, the utilization rate of gantry is improved, the loss rate is reduced and the construction cost is saved by changing the connection mode of gantry and optimizing the treatment of column feet.