Abstract: Plane-symmetric reentry vehicles are designed to operate in a wide range of Mach numbers and dynamic pressures. Confined by the requirements of vehicles on the pay-loads, there would be a small portion of the total weight remained for the vehicle structure. To overcome the weight confinement of this kind of vehicles, topology optimization method was applied to a typical rudder structure. Based on the loads of the structure, the most efficient load transfer path was obtained by the optimization method. This method results in a bio-oriented multi-bifurcation structure, as applied to a typical rudder on a plane-symmetric reentry vehicle. Validation of the structure shows that the resulted structure not only reduces its weight but also satisfies the strength and aeroelasticity requirements.