This article takes the Lecheng Bridge in the Boao Lecheng Pilot Zone of Qionghai City, Hainan Province as the engineering background. Using MIDAS Civil bridge specific analysis software, a simulation model of a super wide steel box girder self anchored suspension bridge is established. According to four different support removal schemes, the relatively best support removal sequence of self-anchored suspension bridge is explored. The analysis results indicate that the support of the mid span cast-in-place section should be removed after the suspension rod is tensioned, therefore, various schemes for dismantling the support have little impact on the stress of the main beam during the completion stage. Only during the construction process, it has a certain impact on the deformation and stress of the main beam; After the tensioning of the suspension rod is completed, some of the main beams at the cable tower detach from the support, which is beneficial for removing the mid span support. After adopting the above construction plan, the structural stress state of the bridge is good. It can provide reference for the construction of such Bridges in the future.