Chéng Liǎoyī 程了一 was an early Northern-Sòng Daoist alchemist, author of KR5c0320 Dān fáng ào lùn 丹房奧論 (“Mystery-Discourse on the Elixir Chamber”), dated 1020 (Tiān xǐ 4, under Sòng Zhēn zōng).
Chéng Liǎoyī 程了一 was an early Northern-Sòng Daoist alchemist, author of KR5c0320 Dān fáng ào lùn 丹房奧論 (“Mystery-Discourse on the Elixir Chamber”), dated 1020 (Tiān xǐ 4, under Sòng Zhēn zōng).