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Application of structural optimization to transmission tower design is of great significance since the cost of transmission tower structure accounts for 30%-40% of the cost of the entire transmission line.In addition, major costs such as material, transpor-tation, erection, and maintenance are directly proportional to structural mass.In the tower structural optimization, the optimization of the tower size is an important aspect.In this paper, base widths of tower, slope and the internode height are considered as design variables to reduce the structural mass of an existing tower under the strength and stability constraints for the tower structure members.By APDL parametric programming language, a parameterized finite element model for calculating intemal forces of the tower structure members is established, treat base widths, bottle width and intemode height as variables.The commercial finite element analysis software Ansys calculates the force of each structure member.And then, on this basis, section size of each member is selected, in order to content Technical Regulation of Design for Tower and Pole Structures of Overhead Transmission Line DL/T5154-2002.The structural analysis and member design procedure is treated as a black-box function for full-scale optimization, which is performed using the mode-pursuing sampling method (MPS).The 500 KV linear tower 5A-ZB32, for instance, verify the full-scale optimization problems of the computational overhead black-box function can be solved by the mode-pursuing sampling method (MPS), and have achieved satisfactory results in the calculation speed and solution quality.