Abstract: The optimum process of extracting corosolic acid, an anti-diabetic component from Eriobotrya japonica leaves was studied. The effects of temperature, time, EtOH consistency and stock ratio on extraction yield of 4 kinds of triterpene acids were investigated by orthogonal test. The optimum extraction conditions were confirmed by the index of extraction yield of corosolic acid as follows: temperature 80℃,time 3.0:h, 80% EtOH as solvent, total stock ratio 1:14(g:mL), extracting twice.

Key words: corosolic acid, Eriobotrya japonica leaves, triterpene acid