Abstract: To examine the effects of species and disposition of trees on absorbing sound of various frequencies an experiment of reducing noise by trees was conducted in the reverberative room by using saplings. In the experiment 6 species of trees and 9 different ways to dispose the saplings were tested.It was found in the result that all of species and disposition had the founctions to absorb sounds but broadleaved species were more effective than coniferous especially.on the sound waves in higher frequency.