Abstract: On the basis of investigating sample plots, in this paper, analyis and studies were made of the fresh weight of aboveground and underground parts of Gardenia jasminoides、Lonicera japonica and Rhizoma Coptidis by using correlation analysis. The results showed:8 years old Gardenia jasminoides could yield 71 kg dried flowers per 0.067 hectare, 8 years old Lonicera japonica could yield 38 kg dried flowers per 0.067 hectare, and 13 300 kg underground fresh weight could be output from 6 years old Rhizoma Coptidis per 0.067 hectare; for Gardenia jasminoides and Lonicera japonica, the growth of the underground part had some effect on the aboveground part, good site conditions could greatly improve their dried flower production. There might be no inevitable connection between the growth of the underground part and the aboveground part for Rhizoma Coptidis.