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For complicated structures assembled by several parts, such as launch vehicle, it is often needed to design a transmission structure which transfers the concentrated external force to uniform forces on a given section of the structure.In aerospace vehicle, many connection areas require to arrange specific structures in order to disperse the concentrated load.The effect of traditional uniform radiation rib design is unsatisfactory because of its excessively conservativeness and unnecessary weight penalty.The optimal truss topo1ogy design transmitting concentrated force on discrete or continuous support has been considered in literatures in the well known Michell truss layout theory.Various combinations of line supports are studied in details.The relation of concentrated force direction and the line supports is critical to the resulting Michell truss configuration.When concentrated force is perpendicular to the support boundary, optimal Michell truss is a straight-bar, which causes stress concentration in the support structure.It is not acceptable in engineering practice.