Abstract: The costume of Pingjin-Ze was one kind of most popular official uniforms in Tang Dynasty.Most people,including the emperor,and government officials with or without rank,would wear the costume,and different colors and materials of ornaments for different ranks.The costume of Pingjin-Ze was made up of Pingjin-Ze,Ku-Xi,Qi-liang belt,boot and so on.In addition,officers must wear Liang-Dang and Teng-She when they took part in guard of honor.The costume of Pingjin-Ze was used as uniform in army,also used as sportswear for riding horse in Tang dynasty.