OBJECTIVE： To optimize supercritical CO2 fluid extraction （SFE-CO2） technology of volatile oil from Hui medicine Huihui Naogengtong for stroke， and to analyze and identify its component. METHODS： With yield of volatile oil and the content of cinnamaldehydeas indexes， and extraction pressure， temperature and time as factors， single factor test and orthogonal test were designed to optimize SFE-CO2 technology； optimized technology was also validated. Physical and chemical indexes of volatile oil were determined， and the constituents of volatile oil were analyzed by GC-MS and retention index. Relative percentage contents of each component were calculated by area normalization method. RESULTS： Optimal technology was as follows as extraction pressure 30 MPa， extraction temperature 50 ℃ and extraction time 100 min. In verification test， the yield of volatile oil was 4.8％ （RSD＝0.02％， n＝3）， and the content of cinnamylaldehyde was 2.0 mg/g （RSD＝1.8％， n＝3）. Physicochemical properties of volatile oil were as follows as relative density 1.05， refractive index 1.52， acid value 28.128 mg（KOH）/g， iodine value 74.47       g（I）/100 g， saponification value 54.2 mg（KOH）/g， peroxide 19.42 meq/kg. GC-MS analysis showed the similarity with retention index in literatures of 31 compounds were more than 80％， 21 of them were identified and accounted for 44％ of total volatile oil， among which E-cinnamaldehyde （9.14％）， β-caryophyllene （3.21％）， α-bisabolol （3.11％） and β-bisabolene （2.56％） had high relative percentage content. CONCLUSIONS： Optimal extraction technology is stable and feasible. The results of extraction technology and component analysis can provide important trail base and reference data for the exploration and utilization of Huihui Naogengtong.