Objective: To study the chemical constituents of Bletilla striata (Thunb. ) Reichb. f. Methods: The con-stituents were separated and purified by column chromatography with silica gel and Sephadex LH-20,and were identified byspectral analysis. Results: Five compounds were identified as: 2, 7-dihydroxy-4-methoxy-9, 10-dihydrophenanthrene (1), 2, 7-dihydroxy-3, 4-dimethoxyphenanthrene (2), 3, 7-dihydroxy-2, 4-dimethoxyphenanthrene (3 ), 3', 3--dihydroxy--5-methoxybiben-zyl(4), p-hydroxybenzaldehyde (5), Conclusion: Compound 2, 3, 4 are isolated from this plant for the first time.

Objective:To study the polar chemical constituents of Blettila striata(Thunb.) Reichb.f. Methods:The constituents in N-butanol moiety were separated and purified by column chromatography with silica gel and SephadexLH-20, and were identified by spectral analysis. Results:Five compounds were identified as: militarine(1);7-hydroxy-4-methoxy-phenanthrene-2-O-?-D-glucoside(2);4-methoxyphenanthrene-2,7-O-?-D-diglucoside(3);7-hydroxy-2,4-dimethoxyphenanthrene-3-O-glucoside(4);3′-hydroxy-5-methoxybibenzyl-3-O-?-glucopyranoside(5). Conclusion:Compound 1,5 were isolated from this plant for the first time.