With the development of modern technology，the cable inspection need linespider to carry instruments instead of artificial inspection.According to the theory of bionics，three different kinds of solutions were proposed in the study of line spider reserch，based on comparing the advantages and disadvantages of three different structure scheme，it was concluded an optimization structure which can go over the most abstacles on the line.And FEM analysis was made for main components of the linespider based on the SolidWorks，which provides the theoretical foundation for further optimization and experiments.