Abstract: It is highly important for the life and reproduction of Monochamus alternatus larvae to bore and build the living and inhabiting tunnel.The research results showed that:there was close relationship between the quantity distribution of Monochamus alternatus larvae tennel and different pine tree height,DBH,region height in tree and the trunk bark thickness.The larval tunnel quantitative ratio increase with the pine tree height and DBH increased,but it was no correlated with the volume of different height region in tree.Most tunnels distributed in the height of 2～3 m and 3～4 m for the trees heighted 4～9 m in anerage.The bark thickness of 1.1～2.0 mm and 3.1～4.0 mm were the highest distribution zone of the larval tunnel distribution ratio in Pinus massomiana and P.taiwanensis host tree.The larvae gave out to gnaw wood warning sound,mean 2 min 35 s/time,for prevent same species larvae intrude into the tunnel.