A structure scheme of the shaped piece brake is proposed for a certain kind of inspection robot working on ultra high voltage transmission line.The mathematical model and mechanical model are established based on geometric parameters of the component.With the numerical analysis software Matlab

the multi-objectively plan and optimization design of shaped piece brake mechanism are realized.By means of the finite element analysis software ANSYS

the mechanism model is analyzed about strength and deformation before and after its optimization design

the results verify the mechanical model is reasonable and the optimization design is feasible.