[Objective] To analyze the volatile constituents of Desmodium styracifolium (Osbeck) Merr. . [Methods] Volatile constituents of Desmodium styracifolium (Osbeck) Merr. were extracted by steam distillation and identified by gas chromatography-mass spectrometry (GC-MS) . [ Results ] Twenty-one kinds of components were separated and identified. [Conclusion] The method is reliable, stable and repeatable and can be used for the analysis of volatile constituents of Desmodium styracifolium (Osbeck) Merr. .