Objective: In order to make use of the resources of total flavanone in pericarp of longan.
Methods: The flavonids were extracted with ethanol. Used spectrophotometry to check the flavanone.
Results: The total flavanone in the pericarp was 1.101 mg/ml and the rate of recovery was 99.98%.
Conclusion: The extraction and purifying methods in this experiment can get the outcome and the purity of the flavanone very high. This method is a purely physical process and has not any pollution. It is an ideal way to extract the flavanone of longan skin.