Abstract: Tamicus piniperda L.is one of the pest-insects causing serious damages to the pine trees in the world or even destroying the Yunnan pine trees. This papar presents an analysis on the distribution of Tomicus Piniperda L.in Yuxi of Yunnan province and the factors causing the pest-insect disaster. which includes types of forest stand, site conditions, climate and human activities. It also puts forward some relevant countermeasures for prevention and control.

Key words: Tomicus piniperda L., prevention and control, Yuxi city