By connecting the court rank with the official post (the official rank system), the court rank system placed the right person in the right post regardless of heredity or power, and also avoided the hereditary transfer of the official post.
位階制度は、位階と官職を関連づけることにより（官位制）、血縁や勢力にとらわれず適材適所を配置し、官職の世襲を防いだ。