Objective To research the chemical constitutes isolated from the rhizomes of Hedychium forrestii Diels. Methods The rhizomes of H. forrestii Diels. were extracted with 95% ethanol，which was suspended in water and then extracted with ethyl acetate. The ethyl acetate extract was extensively separated over chromatographic methods，including silica gel，octadecylsilane（ODS），and Sephadex LH-20. These compounds were elucidated by extensive spectroscopic analysis（MS，NMR，etc. ）. Results five compounds，[5-hydroxy-3，7，4′-trimethoxyflavone（I），3，5-dihydroxy-7，4′-dimethoxyflavone（II），5-hydroxy-7-（4-hydroxy-3-methoxyphenyl）-1-（4-hydroxy-phenyl）-3-heptanone（III），（5R）-5-hydroxy-1-（3，4-dihydroxyphenyl）-7-（4-hydroxy-3-methoxyphenyl）-3-heptanone（IV），stigmast-4-en-3-one（V）. ] were isolated and identified. Conclusion Five compounds were all isolated from Hedychium forrestii for the first time.