Library construction is a fundamental work in Cadence Allegro’s schematic and PCB (printed circuit board) constructing process. Existing part libraries are normally organized in directory structure. With the increment of the amount of library files, part management becomes slow and error-prone which is carried out on manual basis. A new method is given by designing part management software through applying the SKILL technology to aid Cadence Allegro part management. Application results show that the new method is effective in the library construction.