Gathering and revising the Keisho which were lost during the turmoil at the end of the Sui Dynasty, "Standard Text for the Five Classics," which was a revision of the Five Classics by Gan Shiko (Yan Shigu) were distributed in 633.
隋末混乱期に散佚した経書を収集・校定し、貞観(唐)7年（633年）には顔師古が五経を校定した『五経定本』が頒布された。