Objective: To optimize extraction technology conditions of oleanolic acid from Chaenomeles speciosa by supercritical CO2. Method: HPLC was used to determine the content of oleanolic acid

with average between yield and content of oleanolic acid as index

single factor test and orthogonal test were used to investigate extraction temperature

extraction pressure

separation temperature

separation pressure and kind of carrying agent

and compared with optimized process and documentation process. Result: Optimum extraction technology conditions were:extraction temperature of 45 ℃

extraction pressure of 40 MPa

separation temperature of 30 ℃

separation pressure of 8 MPa and carrying agent of 95% ethanol;Supercritical CO2 extraction was superior to other documentation methods. Conclusion: This optimized technology was feasible and stable

it could be used to promote application of oleanolic acid.