In the 16 prefectures of Yan Yun that were ceded to Kitai from Jin, it was published as a national project by referring to a text of Sekkyo (Sekkei) (The Scriptures Inscribed on Stone), which had been kept at Fangshan since the time of Sui.
契丹が後晋から割譲された燕雲十六州の地方で、この地にあった隋以来の房山の石経のテキストも参考にして、国家事業として行なわれた印刷事業であった。