OBJECTIVE： To analyze the volatile components of Cladia aggregate by SPME-GC-MS. METHODS： The column was ZB-5 MSI 5％ benzene-95％ dimethylpolysiloxane fused silica capillary column， programmed temperature was heated from 5 ℃/min to 220 ℃ （maintaining 2 min）， detector was flame ionization detector， carrier gas was high purity He （99.999％）， the column flow rate was 1.0 ml/min， vaporization room temperature was 250 ℃， splitless injection. MS conditions： ion source was electron ionization source， ionizing voltage was 70 eV，  interface temperature was 280 ℃， ion source temperature was 230 ℃， quadrupole temperature was 150 ℃， emission current was 34.6 μA， multiplier voltage was 1 502 V， solvent delay time was 1.5 min， and quality range was 30-500 amu. RESULTS： 19 volatile chemical components were separated and identified from C. aggregate， mainly olefins an aldehydes， alcohols， ketones， furans oxygenated volatile chemical components， relative contents accounted for 63.55％ to all chromatographic peaks in total ion chromatogram， in which， 2，4-octadiene （29.66％）， hexanal （5.93％）， 3-methyl-1，4-heptadiene （5.45％） and furan （4.65％） showed the highest contents. CONCLUSIONS： The study has basically made clear the main volatile components in C. aggregate， which provide certain scientific basis for further exploring C. aggregate.