Abstract: Introduction of Acacia mearnsii at elevations from 1200m to 2200m of the dry-hot valley of Jinsha River isaimed at testing its adaptabilities to local environment．The results show that the species suit to dry-hot valley environment and has great potentials as a pioneering tree for afforestation in mid-mountain of this area ．The results also indicate that this species grow better at low elevation and on the sites with better conditions．