A set of ecological control methods for Tomicus piniperda was carried out in 1333 ha Yunnan pine forestry in Yanshan of Yunnan Province,which included with basic methods of plantation techniques and clearing-up of insect born trees,complemented with managements of biological insecticide and chemical insecticide on some selected trees.It showed that after this ecological control on the insects,three indices of insect damage,i.e.insect occurrence rate, the rate of damaged trig and died tree decreased signific...