Abstract: Objective To study the chemical constituents of Salvia rniitiorrhiza f. alba. Methods The compounds were isolated by chromatographic techniques and their structures were elucidated by spec- troscopic analysis. Results Four compounds were obtained from the plant and identified as 8, 9-dihydro- 1, 6-dimethylfuro[3, 2-c] naphtha[2, 1-e] oxepine-10, 12-dione (I), tanshindiol C (II), salviolone (Ⅲ), 1, 2, 6, 7, 8, 9-hexahydro-1, 6, 6-trimethyl-3, 11-dioxanaphtho[2, 1-e] azulene-10, 12-dione (Ⅳ). Conclusion Compound I is a new one, named salmilalbanone (8, 9-dihydro-1, 6-dimethylfuro[3, 2-c] naphtha[2, 1-e] oxepine-10, 12-dione), while compounds Ⅱ-Ⅳ are isolated from the plant for the first time.