Thirteenth-century Daoist author writing under the pseudonym Chángquánzǐ 長筌子 (“Master Fish-Trap” — evoking the Zhuāngzǐ parable of the fish-trap that is forgotten once the fish is caught). Otherwise unknown outside his surviving Daozang works (cf. DZ 1064 Dòngyuán jí). He is the author of two commentaries preserved in the Daozang under different scripture-titles but substantially identical in content:
- Yuánshǐ tiānzūn shuō tàigǔ jīng zhù 元始天尊說太古經註 (DZ 103).
- Tàishàng chìwén dònggǔ jīng zhù 太上赤文洞古經註 (DZ 107).
Both commentaries expound the way to immortality through cessation of outer perception. Chángquánzǐ is also the author of the Dòngyuán jí 洞淵集 (DZ 1064) — a collection of poems and short essays — but his biographical identity is irrecoverable from the extant sources. No CBDB record was found.