The invention belongs to the field of high-speed design, and a method for automatically optimizing a passive link of a high-speed serial bus is disclosed. By splitting the high-speed serial link intomodules, and modeling a single module, the best link scheme is optimized through a standardized high-speed bus topology template. The concrete realization includes establishing a passive link structure library, establishing a high-speed bus topology template, and realizing automatic optimization of physical structure, thereby making the passive characteristics of the whole link meet the requirements of bus protocol, and guiding the layout and routing design.