Objective:To analyse the infrared spectrum of the 50% ethanol extract of Aralia elata leaves,to establish the infrared spectrum(IR) fingerprint of Aralia elata leaves,and to discuss the difference of Aralia elata leaves planted in different regions and havested at different time.Methods:Dry extracts of Aralia elata leaves were tested by IR to form the common mode for the second order derivative analysis.And hierarchical clustering analysis was performed by SPSS based on the peak wave number of 20 samples.Re...