OBJECTIVE： To establish a method for analyzing the volatile components in Cuscuta chinensis， and compare the difference of the volatile components in C. chinensis. METHODS： HS-SPME-GC-MS was adopted： sampling amount was 1.0 g， extracting fibers was 65 μm PDMS/DVB， equilibrium temperature was 120 ℃， equilibrium time was 15 min， extraction time was 30 min， resolution time was 3 min； GC conditions： the column was HP-5MS quartz capillary column， programmed temperature， inlet temperature was 230 ℃， carrier gas was high purity helium， the flow rate was 1.0 ml/min， splitless injection； MS conditions： ion source was electron ionization， temperature was 230 ℃， quadrupole temperature was 150 ℃， electron energy was 70 eV， photomultiplier tube voltage was 1.2 kV， the interface temperature was 280 ℃， and scanning range was m/z 35-550. Combined with the qualitative analysis for volatile components of C. chinensis from different habitats by HP ChemStation， the relative content was calculated by peak area normalization， and the data was analyzed by principal component analysis and cluster analysis. RESULTS： Totally 52 components were identified， 9 of which were the common components in C. chinensis， namely leaf alcohol， 1-octene-3-ol， 3-octanol， malt alcohol， diethyl phthalate， caryophyllene， nonaldehyde， octanol and palmitic acid. sample 1， 2， 3 were clustered into a group， then clustered with 4， 5， 6 into a group， sample 7， 8， 9 was clustered into a group， then clustered with 10， 11， 12 into a group， and sample 13， 14， 15 clustered into a group individually. CONCLUSIONS： The method is stable and reliable， and suitable for the rapid analysis of volatile components in C. chinensis； and differences of volatile components in C. chinensis from diflerent habitats are discernible.