Chén Fǎ 陳法, zì Dìngzhāi 定齋, was a Kāngxī-Yōngzhèng-period official and Yìjīng scholar from Ānpíng 安平 (modern Pínggǎng 平壩, Guìzhōu 貴州). He passed the jìnshì in Kāngxī guǐsì 康熙癸巳 = 1713 and held office through Daotai (dào 道) of Dàmíng 大名 in Zhílì 直隸. The catalog meta provides no birth-or-death dates; standard biographical sources are silent.
His one surviving work in the Sìkù is the Yì jiān 易箋 (KR1a0146) in eight juàn. Its main argument: the Yì speaks exclusively of human affairs (rén shì 人事); the Tuàn and line statements have no direct mention of heavenly objects (heaven-and-earth, thunder-and-wind) or yīnyáng. The Sìkù editors note this thesis as overstated (the Tuàn of Zhèn speaks of “thunder shaking a hundred lǐ”; the Tuàn of various hexagrams speaks of “beneficial to cross the great river” referring to Kǎn water) but find his overall position substantively sound and free of fragmentariness. The work also contains a substantial critique of Lái Zhīdé’s 來知德 (KR1a0100) cuò zōng doctrine and a fresh treatment of milfoil-divination procedure.