Abstract: The Spirit Valley forest, though seriously damaged in its past, has been well protected since 1940s. It possesses the genetal characteristics of the local vegetation in its floristic composition, appeatance and stand structure and is now in a stage of successional change. As compared with that in 1951, the pine forest (Pinus mass-oniana) is now reaching its mature age. Though its seedlings are numerous, none of them has become established. Several hardwood species have invaded the pine forest, their young trees forming the second storey of the stand and presumably replacing the pines eventually. Similarly, the hardwood stand is also in an active stage of successional change. Some intolerant species, such as oriental white oak (Qutrcus al-iena ?) and other species were the dominant elements in the stand thirty years ago, but now have become less prominent because of their poor regeneration. Instead, numerous young trees of intolerant species such as losewood (Dalbergia hupeana) and Taiwan sweetgum (Liquidambar formosana) are glowing well undet the canopy. Such a dynamic change is actively under way. If the Spirit Valley foiest is well protected from further destruction, it will very possibly develop into a climax hardwood forest eventually which is the typical forest vegetation in this region.