Northern-Sòng Yì-numerologist active under Rénzōng (r. 1023–1063), a follower of Liú Mù 劉牧 and developer of his chart-tradition. He authored Lüèlì yǐnjué 畧例隱訣, a now-lost work elaborating the Yìshù gōuyǐn tú 易數鉤隱圖 (KR1a0011) chart-corpus. His school is referenced in the Sìkù tíyào to the Gōuyǐn tú as one of three Sòng works (with Wú Mì 吳秘’s Tōngshén and Chéng Dàchāng 程大昌’s Yìyuán) that developed Liú Mù’s system.