This study examined supplier attributes of log purchases by Taiwanese importers. A total of 47 pure trading companies and 36 manufacturers were asked to rate each attribute based on importances and differences. ANOVA and Duncan's new multiple range test were used to detect if differences existed among supplier attributes. Log quality, reliability of quantity delivered, supply stability, log price and prompt delivery were the attributes that most influenced the purchase decisions of respondents. Origin of source, after-purchase services, and suppliers' reputation and ethnicity were the least influential attributes. No differences were detected between the responces of pure trading companies and manufacturers.