Objective:The aim of this paper was to study the chemical constituents of Ramulus of Cinnamomum cassia. Method: The compounds were isolated and purified by silica gel column

sephadex LH-20 column chromatography. Their structures were identified by physicochemical properties and spectral data. Result: Sixteen compounds have been isolated from the EtoAc and N-butanol fractions. They were identified as E-cinnamic acid (1)

vanillin (2)

4-hydroxy-2-methoxycinnamaldehyde (3)

sinapaldehyde (4)

(E)-3

3'-dimethoxy-4

4'-dihydroxystilbene (5)

(2S)-1-O-heptatriacontanoyl glycerol (6)

tricosanoic acid (7)

stigmast-4-ene-3

6-dione (8)

2

3-dihydroxypropyl henicosanoate (9)

heptadecanoic acid(10)

β-sitosterol acetate (11) coumarin (12)

E-cinnamic alcohol (13)

3-hydroxy-4-methoxy-benzoic acid (14)

vanillic acid (15)

and syringaldehyde (16)

respectively. Conclusion: Compounds 3-9

14

15 were obtained from this plant for the first time.