Objective To determine the flavonoids from the rhizome of Amomum maximum Roxb. in the family zingiberaceae. Methods Using various separation and purification methods(including silica gel, reversed-phase RP-18, Sephadex LH-20, and preparative HPLC), and physicochemical properties and spectral data techniques, the compounds from the methanol extract of A. maximum was separated and authenticated. Results Eleven compounds were isolated and identified as boesenbergin B(1), (2E)-1-(5-hydroxy-7-methoxy-2-methyl-2-(4-methylpent-3-enyl)-2H-chromen-6-yl)ethanone(2), helichrysetin(3), kaempferide(4), rhamnesin(5), isokaempferide(6), kumatakenin(7), pinocembrin(8), 5, 7-dimethoxyflavanone(9), pinostrobin(10), and 4,4′-dihydroxy-2′,6′-dimethoxychalcone(11). Conclusion Compounds 1-11 were isolated from the plant for the first time, compounds 1-11 were first isolated from the genus of Amomum, and compounds 2, 3 and 6 were first isolated from the family of Zingiberaceae.