Abstract: Purple clothing was only for high class officials in the Tang Dynasty. The strict regulations of dressing purple were enacted by the governor.The article made a discussion on the regulations of dressing purple in the Tang Dynasty.The emperor awarded purple or crimson clothing to the ministers or subordinates who had performed meritorious service,this was a particular regulation from the Tang Dynasty.Later,the scope of awarding became wider and wider,and some who were not qualified also put on purple clothing.This was so called borrowing color.Though there was strict regulation on dressing color,a lot of people violated it.Even forbiddances put forward by the emperor could not stop the violations.The article also discussed how the purple looked like in the Tang Dynasty, and argued that the purple might be dark-blue-purple.