Fifteen ring-porous hardwood species in Taiwan were investigated to build up the database from macroscopic features for identification of driftwood. Data of vessel, ray and parenchyma from fifteen species of woods were quantified. The difference among species with same macroscopic features was examined. The results show that there were difference among different species within the same feature which is not sufficient to completely differenate the wood species. Various features should be examined simultaneously to identify different species. This means that even though there are similarities among species, the difference of macroscopic features of the whole could be used to identify those fifteen ring-porous hardwood species without confusion.